Tag Archives: submarine

‘Sharkcano’: NASA captures eruption of submarine volcano, home to 2 shark species

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The image, taken on May 14 by the Operational Land Imager 2 on the Landsat 9 satellite, shows a plume of discolored water being emitted from the submarine volcano. The satellite is designed to capture high-resolution images of our planet.

The Kavachi volcano in the Solomon Islands is one of the most active submarine volcanoes in the Pacific, NASA said. The volcano is about 15 miles (24 kilometers) south of an island called Vangunu.
Kavachi was dubbed “Sharkano” after a 2015 expedition to the site revealed that the crater was an unlikely home to two species of shark, suggesting that large marine animals are able to exist in an extreme environment, tolerating hot and acidic water.
A scalloped hammerhead and the silky shark were among multiple fish species spotted living in the active volcano by researchers. To peer inside Kavachi’s crater, the scientists deployed a baited drop camera to a depth of 164 feet (50 meters), according to the journal Oceanography.

The volcano erupts almost continuously, according to NASA, and steam and ash are often visible. The nearby island is named for a sea god of the Gatokae and Vangunu peoples, and it’s sometimes also referred to as Rejo te Kvachi, or “Kavachi’s Oven.”



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Antarctic Orca Submarine Volcano Blasted by Swarm of 85,000 Earthquakes

The Carlini base on King George Island, hosting the seismometer located closest to the seismic region, and the Bransfield Strait. Credit: Milton Percy Plasencia Linares

In a remote area, a mix of geophysical methods identifies magma transfer below the seafloor as the cause.

Even off the coast of Antarctica, volcanoes can be found. A sequence of more than 85,000 earthquakes was recorded in 2020 at the deep-sea volcano Orca, which has been inactive for a long time, a swarm quake that reached proportions not previously observed for this region. The fact that such events can be studied and described in remarkable detail even in such remote, and therefore poorly instrumented areas, is now shown by the study of an international team published in the journal Communications Earth and Environment.

Researchers from Germany, Italy, Poland, and the United States were involved in the study, which was led by Simone Cesca of the German Research Centre for Geosciences (GFZ) Potsdam. They were able to combine seismological, geodetic, and remote sensing techniques to determine how the rapid transfer of magma from the Earth’s mantle near the crust-mantle boundary to almost the surface caused the swarm quake.

The Orca volcano between the tip of South America and Antarctica

Swarm quakes mainly occur in volcanically active regions. The movement of fluids in the Earth’s crust is therefore suspected as the cause. Orca seamount is a large submarine shield volcano with a height of about 900 meters above the seafloor and a base diameter of about 11 kilometers. It is located in the Bransfield Strait, an ocean channel between the Antarctic Peninsula and the South Shetland Islands, southwest of the southern tip of Argentina.

Illustration of the seismically active zone off Antactica. Credit: Cesca et al. 2022; nature Commun Earth Environ 3, 89 (2022); doi.org/10.1038/s43247-022-00418-5 (CC BY 4.0)

“In the past, seismicity in this region was moderate. However, in August 2020, an intense seismic swarm began there, with more than 85,000 earthquakes within half a year. It represents the largest seismic unrest ever recorded there,” reports Simone Cesca, a scientist in GFZ’s Section 2.1 Earthquake and Volcano Physics and lead author of the now published study. At the same time as the swarm, a lateral ground displacement of more than ten centimeters and a small uplift of about one centimeter was recorded on neighboring King George Island.

Challenges of research in a remote area

Cesca studied these events with colleagues from the National Institute of Oceanography and Applied Geophysics — OGS and the University of Bologna (Italy), the Polish Academy of Sciences, Leibniz University Hannover, the German Aerospace Centre (DLR) and the University of Potsdam. The challenge was that there are few conventional seismological instruments in the remote area, namely only two seismic and two GNSS stations (ground stations of the Global Navigation Satellite System which measure ground displacement). In order to reconstruct the chronology and development of the unrest and to determine its cause, the team therefore additionally analyzed data from farther seismic stations and data from InSAR satellites, which use radar interferometry to measure ground displacements. An important step was the modeling of the events with a number of geophysical methods in order to interpret the data correctly.

Reconstructing the seismic events

The researchers backdated the start of the unrest to 10 August 2020 and extend the original global seismic catalog, containing only 128 earthquakes, to more than 85,000 events. The swarm peaked with two large earthquakes on 2 October (Mw 5.9) and 6 November (Mw 6.0) 2020 before subsiding. By February 2021, seismic activity had decreased significantly.

The scientists identify a magma intrusion, the migration of a larger volume of magma, as the main cause of the swarm quake, because seismic processes alone cannot explain the observed strong surface deformation on King George Island. The presence of a volumetric magma intrusion can be confirmed independently on the basis of geodetic data.

Starting from its origin, seismicity first migrated upward and then laterally: deeper, clustered earthquakes are interpreted as the response to vertical magma propagation from a reservoir in the upper mantle or at the crust-mantle boundary, while shallower, crustal earthquakes extend NE-SW triggered on top of the laterally growing magma dike, which reaches a length of about 20 kilometers.

The seismicity decreased abruptly by mid-November, after about three months of sustained activity, in correspondence to the occurrence of the largest earthquakes of the series, with a magnitude Mw 6.0. The end of the swarm can be explained by the loss of pressure in the magma dike, accompanying the slip of a large fault, and could mark the timing of a seafloor eruption which, however, could not yet be confirmed by other data.

By modeling GNSS and InSAR data, the scientists estimated that the volume of the Bransfield magmatic intrusion is in the range 0.26-0.56 km³. That makes this episode also the largest magmatic unrest ever geophysically monitored in Antarctica.

Conclusion

Simone Cesca concludes: “Our study represents a new successful investigation of a seismo-volcanic unrest at a remote location on Earth, where the combined application of seismology, geodesy, and remote sensing techniques are used to understand earthquake processes and magma transport in poorly instrumented areas. This is one of the few cases where we can use geophysical tools to observe intrusion of magma from the upper mantle or crust-mantle boundary into the shallow crust — a rapid transfer of magma from the mantle to almost the surface that takes only a few days.”

Reference: “Massive earthquake swarm driven by magmatic intrusion at the Bransfield Strait, Antarctica” by Simone Cesca, Monica Sugan, Łukasz Rudzinski, Sanaz Vajedian, Peter Niemz, Simon Plank, Gesa Petersen, Zhiguo Deng, Eleonora Rivalta, Alessandro Vuan, Milton Percy Plasencia Linares, Sebastian Heimann and Torsten Dahm, 11 April 2022, Communications Earth & Environment.
DOI: 10.1038/s43247-022-00418-5



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Navy engineer’s wife pleads guilty in nuclear submarine spy scheme

Toebbe, 46, will face up to three years in prison as part of the plea agreement. Toebbe pleaded guilty to one count of conspiracy to communicate restricted data, which typically carries a maximum sentence of life in prison.

FBI agents were monitoring and surveilling the Toebbes for months after an undisclosed foreign government informed the FBI that Jonathan Toebbe had sent them a package offering to sell nuclear secrets, according to the criminal complaint. They were eventually arrested on October 9 at what was to be a fourth dead-drop location.

According to the plea agreement, Toebbe acted as a lookout for her husband during three “dead drops” — two in West Virginia and one in Pennsylvania — where they delivered SD cards containing classified information about nuclear submarines to undercover federal agents.

The couple allegedly went to great lengths to hide the SD cards at the dead-drop locations over the course of several months, tucking an SD card into a saran-wrapped peanut butter sandwich in one instance, while others were hidden inside a packet of gum and a sealed Band-Aid wrapper, according to prosecutors.

Federal Magistrate Judge Robert Trumble accepted Toebbe’s guilty plea, days after accepting her husband’s.

Another judge will sentence her at a later date. That judge will have the option to impose a different sentence than agreed upon by Toebbe and prosecutors. She will remain in federal custody until her sentencing date.

Toebbe had repeatedly tried to be released on bond, claiming until now that she did not know about her husband’s plans even though she accompanied him to the dead drops.

As part of Toebbe’s plea agreement, she has agreed to cooperate with investigators, including sitting for a polygraph exam if requested, allowing them access to her electronic devices and accounts, and assisting them in retrieving the $100,000 in Monero cryptocurrency stemming from this case.

Toebbe also faces a $100,00 fine and up to five years of supervised release. She received limited immunity in exchange for her plea.

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Russian warship chases off U.S. submarine near Pacific islands, Moscow says

A Russian anti-submarine destroyer chased off a U.S. submarine near the Kuril Islands, forcing it to leave the country’s territorial waters, Moscow said Saturday, amid raging tensions over Ukraine.

A Pentagon spokesman, asked by AFP for comment, said only: “We are aware of press reporting about an alleged naval incident in the Pacific. We cannot confirm the details of these reports at this time.”

A senior administration official said Saturday they had no additional information about the alleged incident.

The Russian defense ministry said that during planned military drills the Marshal Shaposhnikov destroyer detected a U.S. Navy Virginia-class submarine in Russian territorial waters near the Kuril Islands in the northern Pacific.

When the submarine ignored demands to surface, the crew of the frigate “used appropriate means” and the U.S. submarine left at full speed, the ministry said, without providing further details.

The ministry also said it had summoned the U.S. defense attaché in Moscow over the incident.

“In connection with the violation by the U.S. Navy submarine of the state border of the Russian Federation, the defense attaché at the U.S. embassy in Moscow was summoned to the Russian defense ministry,” the defense ministry said.

The Kurils, which lie north of Japan’s Hokkaido island, have been controlled by Moscow since they were seized by Soviet troops in the waning days of World War II. The incident took place near the Kuril island of Urup.

It came amid soaring tensions between Russia and the West that have seen Moscow surround Ukraine on three sides with more than 100,000 troops, with Washington warning that an all-out invasion could begin “any day.”

Russian President Vladimir Putin on Saturday condemned the claims as a “provocation.”

U.S. President Joe Biden warned Putin Saturday that the United States will “respond decisively and impose swift and severe costs” should Russia invade Ukraine. The warning comes as U.S. officials say a Russian invasion could begin “at any time.”

With an escalated Russian military buildup on the borders of Ukraine, Mr. Biden emphasized on a phone call with Putin that an invasion “would produce widespread human suffering and diminish Russia’s standing.”

The U.S. State Department has ordered non-emergency employees to leave the U.S. embassy in Kyiv, Ukraine.  

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USS Nevada: US Navy ballistic missile submarine makes rare appearance in Guam

The USS Nevada, an Ohio-class nuclear-powered submarine carrying 20 Trident ballistic missiles and dozens of nuclear warheads, pulled into the Navy base in the US Pacific Island territory on Saturday. It’s the first visit of a ballistic missile submarine — sometimes called a “boomer” — to Guam since 2016 and only the second announced visit since the 1980s.

“The port visit strengthens cooperation between the United States and allies in the region, demonstrating US capability, flexibility, readiness, and continuing commitment to Indo-Pacific regional security and stability,” a US Navy statement said.

Movements of the 14 boomers in the US Navy’s fleet are usually closely guarded secrets. Nuclear power means the vessels can operate submerged for months at a time, their endurance limited only by the supplies needed to sustain their crews of more than 150 sailors.

The Navy says Ohio-class submarines stay an average of 77 of days at sea before spending about a month in port for maintenance and replenishment.

It’s rare for one to even be photographed outside their home ports of Bangor, Washington, and Kings Bay, Georgia. The secrecy surrounding the ballistic missile submarines makes them the “most important survivable leg of the nuclear triad,” which also includes silo-based ballistic missiles on the US mainland and nuclear-capable bombers like the B-2 and B-52.

But with tensions brewing between the US and China over the status of the self-ruled island of Taiwan, and as North Korea ramps up missile tests, Washington can make a statement with its ballistic missile submarines that neither Beijing nor Pyongyang can, according to the analysts.

“It sends a message — intended or not: we can park 100-odd nuclear warheads on your doorstep and you won’t even know it or be able to do much about it. And the reverse isn’t true and won’t be for a good while,” said Thomas Shugart, a former US Navy submarine captain and now an analyst at the Center for a New American Security.

North Korea’s ballistic submarine program is in its infancy, and China’s estimated fleet of six ballistic missile submarines is dwarfed by the US Navy’s.

And China’s ballistic missile subs don’t have the capabilities of the US boomers, according to a 2021 analysis by experts at the Center for Strategic and International Studies.

China’s Type 094 ballistic missile subs are two times louder than the US subs, and therefore more easily detected, and carry fewer missiles and warheads, CSIS analysts wrote in August.

Besides the political signaling, the presence of the USS Nevada in the region presents another opportunity, said Alessio Patalano, professor of war and strategy at King’s College in London.

“The presence of this type of boat — especially in training and exercises — adds an important opportunity to learn how to hunt those of other actors in the region,” Patalano said.

“The DPRK (North Korea) is pursuing the development of such a type of a platform, and China already fields them. Honing in the skills to track them is as important as deploying them as strategic deterrent,” he said.

The last time a US Navy boomer visited Guam was in 2016, when the USS Pennsylvania stopped there.

Analysts said tensions across the Indo-Pacific have significantly increased since that time, and more such military displays are likely from Washington in the current environment.

“This deployment reminds us that the nuclear order at sea in the (Indo-Pacific) matters, and whilst often outside wider public conversation, we are likely to see more of it in the development of regional strategic balance,” Patalano said.

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French ambassador accuses Australia of deceit over submarine deal

  • Australia cancelled a deal with France’s Naval Group in Sept.
  • The fallout threatens to spill over into trade consequences
  • French ambassador said message leaks represented a “new low”

CANBERRA/SYDNEY, Nov 3 (Reuters) – France’s ambassador to Australia, Jean-Pierre Thebault, said on Wednesday that Australia acted with deceit when it abruptly cancelled a multi-billion dollar deal with Paris to build a fleet of submarines.

“The deceit was intentional,” Thebault told media in Canberra on Wednesday.

“And because there was far more at stake than providing submarines, because it was a common agreement on sovereignty, sealed with the transmission of highly classified data, the way it was handled was a stab in the back.”

Australia in September cancelled a deal with France’s Naval Group, opting instead to build at least 12 nuclear-powered submarines in a deal with the United States and Britain. read more

The new alliance, dubbed AUKUS, is designed to give Australia access to nuclear-powered submarines for the first time.

The decision has caused a major bilateral rift, with France recalling its ambassadors from Australia and the United States in protest. Thebault returned to Canberra last month and the speech on Wednesday is the first time he has spoken publicly on the bilateral relationship.

“These are not things which are done between partners – even less between friends,” said Thebault, who added that the French government had no gripe with the people of Australia.

Australian Prime Minister Scott Morrison declined to refute Thebault’s comments when speaking on Wednesday in the United Arab Emirates en route from the U.N COP26 climate summit.

“Claims were made and claims were refuted, what is needed now is for us to move on,” Morrison told reporters.

French President Emmanuel Macron on Sunday said Morrison had lied to him about Canberra’s intentions. read more

Morrison has denied the claim. He said he had previously explained to Macron that conventional submarines would no longer meet Australia’s needs.

Morrison and Macron spoke last week before the Australian leader publicly sought a handshake with his French counterpart at the G20 meeting.

The destabilisation of the usually close diplomatic relations between the two nations now threatens to spill over into trade consequences.

The European Union has twice postponed a planned round of free trade talks with Australia. In solidarity with France, European Commission President Ursula von der Leyen questioned whether the bloc could strike a trade deal with Australia. read more

The relationship was tested further this week after Australian media published leaked messages between Morrison and Macron that attempted to counter France’s claim that Australia did not give it sufficient warning that the contract would be cancelled. read more

Thebault said the leaking of the messages represented an “unprecedented new low” and he said that it sent a worrying signal to heads of state that confidential correspondence could one day be “weaponised against you”.

Australia’s Deputy Prime Minister Barnaby Joyce said Macron was wrong to accuse Morrison of lying.

“We had a major political leader call the prime minister of Australia a liar, and you can’t do that diplomatically,” Joyce told the Australian Broadcasting Corporation.

“This isn’t some tin-pot nation in the middle of nowhere… if a person calls you a liar, what are you going to do? You have to defend it and say you are not.”

U.S. President Joe Biden said last week that the handling of the new pact had been clumsy, adding that he had thought France had been informed of the contract cancellation before the new pact was announced.

Reporting by Jonathan Barrett, Colin Packham and Renju Jose; Editing by Himani Sarkar and Michael Perry

Our Standards: The Thomson Reuters Trust Principles.

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USS Connecticut: Navy investigation finds US nuclear-powered submarine hit uncharted underwater mountain

The USS Connecticut had been operating in the contested waterway when it struck the object on October 2, but it was unclear at the time what it had hit.

“The investigation determined USS CONNECTICUT grounded on an uncharted seamount while operating in international waters in the Indo-Pacific region,” a 7th Fleet spokesperson told CNN in a statement. US 7th Fleet operates in the Western Pacific and Indian oceans.

Though the Seawolf-class submarine suffered some injuries to crew members and some damage, the Navy said the nuclear propulsion plant was not damaged in the accident. None of the injuries were life-threatening.

The command investigation for the USS Connecticut has been submitted to Vice Adm. Karl Thomas, the commander of 7th Fleet, for his review, according to the statement. Thomas will decide whether “follow-on actions, including accountability, are appropriate.”

USNI News was the first to report the findings of the investigation.

The collision came at a particularly sensitive time in US-China relations, as the Chinese military was sending waves of aircraft into Taiwan’s Air Defense Identification Zone. On the day of the crash, China flew 39 aircraft into the Air Defense Identification Zone. Two days later, China flew a record 56 aircraft into the zone in a 24-hour period.

Though the number of incursions ebbed for a short period, they have since begun again. On Sunday, Taiwan’s Ministry of Defense said eight People’s Liberation Army aircraft entered the Air Defense Identification Zone, with another six flying in on Monday.

Meanwhile, the tensions between Washington and Beijing have increased. Last week, US Secretary of State Antony Blinken called for Taiwan to have “meaningful participation” at the United Nations, calling Taiwan’s participation “not a political issue, but a pragmatic one.”

The statement drew an angry rebuke from Beijing, which views unification with the independently ruled island as one of its primary objectives and adamantly opposes Taipei’s participation in international forums.

“Should the US side choose to continue playing the ill-advised ‘Taiwan card,’ it would inevitably pose seismic risks to China-US relations, seriously undermine peace and stability across the Taiwan Strait, and gravely harm the interests of the US itself,” Foreign Ministry spokesman Zhao Lijian said a day after Blinken’s statement.

Zhao also said that Taipei’s current policy is “the greatest realistic threat to peace and stability across the Taiwan Strait.”

On Thursday, Taiwan’s defense minister openly acknowledged that US military personnel are training Taiwanese troops.

“The US military is only assisting in training (our troops), but they are not based here,” Chiu Kuo-cheng said, according to Taiwan’s official Central News Agency.

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Australia’s PM attacks French president’s credibility over submarine deal

Australia’s Prime Minister Scott Morrison presents his national statement as part of the World Leaders’ Summit of the COP26 UN Climate Change Conference in Glasgow, Scotland on November 1, 2021.

Ian Forsyth | AFP | Getty Images

Australian Prime Scott Morrison attacked the credibility of French President Emmanuel Macron as a newspaper quoted a text message that suggested France anticipated “bad news” about a now-scuttled submarine deal.

An Australia newspaper cast doubt on President Joe Biden’s explanation to Macron last week that the U.S. leader thought the French had been informed long before the September announcement that their 90 billion Australian dollar ($66 billion) submarine deal with Australia would be scrapped.

Macron this week accused Morrison of lying to him at a Paris dinner in June about the fate of a 5-year-old contract with majority French state-owned Naval Group to build 12 conventional diesel-electric submarines. Australia canceled that deal when it formed an alliance with U.S. and Britain to acquire a fleet of eight nuclear-powered submarines built with U.S. technology.

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Morrison told Australian reporters who had accompanied him to Glasgow, Scotland, for a U.N. climate conference that he made clear to Macron at their dinner in June that conventional submarines would not meet Australia’s evolving strategic needs.

Two days before Morrison, Biden and British Prime Minister Boris Johnson announced the nuclear submarine deal, Morrison attempted to phone Macron with the news, but the French leader texted back saying he was not available to take a call, The Australian newspaper reported.

Macron asked: “Should I expect good or bad news for our joint submarines ambitions?” the newspaper reported Tuesday.

A journalist asked why Morrison decided to leak the text message after Macron accused him of lying, but the prime minister did not directly answer.

“I’m not going to indulge your editorial on it, but what I’ll simply say is this: We were contacted when we were trying to set up the … call and he made it pretty clear that he was concerned that this would be a phone call that could result in the decision of Australia not to proceed with the contract,” Morrison said.

French officials said their government had been blindsided by the contract cancellation which French Foreign Minister Jean-Yves Le Drian described as a “stab in the back.”

Macron said this week the nuclear submarine deal was “very bad news for the credibility of Australia and very bad news for the trust that great partners can have with Australia.”

Morrison said Macron’s accusation of lying, which the prime minister denies, was a slur against Australia. Most Australian observers see it as a personal insult against Morrison.

“I don’t wish to personalize this, there’s no element of that from my perspective,” Morrison said.

“I must say that I think the statements that were made questioning Australia’s integrity and the slurs that have been placed on Australia, not me — I’ve got broad shoulders, I can deal with that — but those slurs, I’m not going to cop sledging of Australia. I’m not going to cop that on behalf of Australians,” Morrison said. Sledging is a cricketing term for abusive needling of opponents.

Biden told Macron that the handling of the Australian submarine alliance was “clumsy” and “not done with a lot of grace.”

“I was under the impression that France had been informed long before that the (French) deal would not go through. I honest to God did not know you had not,” Biden told Macron.

French president Emmanuel Macron speaks during a plenary session as part of the World Leaders’ Summit of the COP26 UN Climate Change Conference in Glasgow on November 1, 2021. –

Alain Jocard | AFP | Getty Images

But a 15-page document negotiated by the White House National Security Council with Australian and British officials detailed to the hour how the world would be told about the trilateral submarine deal, The Australian reported.

“Everything was timed and understood completely,” an unnamed Canberra source told the newspaper.

Turnbull weighs in

Malcolm Turnbull, the Australian prime minister who signed the French submarine contract and considers Macron a personal friend, has accused News Corp newspapers, including The Australian, of being biased toward Morrison’s conservative government.

Morrison “can twist and turn and leak a text message here and leak a document there to his stenographic friends in the media, but ultimately the failure here was one of not being honest,” Turnbull told Australian Broadcasting Corp.

“Scott Morrison should apologize … because he did very elaborately and duplicitously deceive France,” Turnbull added.

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Macron says Morrison lied to him about AUKUS submarine deal

The new security alliance, dubbed AUKUS and which could give Australia access to nuclear-powered submarines, caught Paris off guard and saw the French ambassadors recalled from Washington and Canberra amid accusations France had been betrayed.

“I have a lot of respect for your country. I have a lot of respect and a lot of friendship for your people. I just say when we have respect, you have to be true and you have to behave in line and consistently with this value,” Macron told a group of Australian reporters who had traveled to cover the G20.

Asked if he thought Morrison had lied to him, Macron replied “I don’t think, I know.”

Morrison, speaking later at a media conference on Sunday in Rome, said he had not lied and that he had previously explained to Macron that conventional submarines would no longer meet Australia’s needs.

“I was very clear that what was going to be provided to us was not going to meet our strategic interests, and there was still a process we were engaged in, and we then engaged in, over the months that followed. And then we communicated to him (Macron) our ultimate decision,” Morrison said.

Morrison repeated the acquisition of at least eight nuclear propelled submarines in a new deal with the US and UK was preferable to the 2016 agreement with France.

“The Australian Government secured this, something that no previous government has been able to secure in 50 years, and this has well-positioned Australia to defend ourselves into the future. So I make no apologies for getting the right result from Australia. And we knew it would be a difficult decision.”

Asked about how his administration would move forward with France, Morrison said that his administration has begun to fix relations on projects of shared and mutual interest, particularly in the Indo-Pacific, but admitted that “these things take time.”

On Friday, US President Joe Biden said he had thought France had been informed of the contract cancellation before the AUKUS pact was announced, and said that the handling of the new security agreement had been clumsy.

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Biden and Macron will meet face-to-face for first time since clash over Australian submarine deal

The highly anticipated bilateral meeting between the long-standing allies will take place ahead of the Group of 20 meeting in Rome and the United Nations’ subsequent climate summit in Glasgow.

White House national security adviser Jake Sullivan told reporters aboard Air Force One en route to Rome that he expects the meeting to be “constructive and deeply substantive,” and that Biden and Macron will cover a gamut of issues facing their alliance, from “counterterrorism in the Middle East to great power competition to economic, trade and technology issues.”

Sullivan said a “forward-looking” statement is expected to be released following the meeting, which will touch on areas of cooperation, counterterrorism, the Indo-Pacific, energy and technology.

The two leaders are also expected to be in the same room for other meetings throughout the summits.

Last month, the US, the United Kingdom and Australia announced a new partnership that includes providing assistance to help Australia develop nuclear-powered submarines — a deal France says was made without its knowledge, jeopardizing an existing contract worth billions to provide Australia with diesel-powered submarines.

The rift escalated to the rare point that France temporarily recalled its US ambassador, and even Biden was caught off-guard by how furious French officials became over the matter.

In mid-September, the two leaders spoke over the phone, appearing to ease some of the tensions.

During the 30-minute call, Biden appeared to acknowledge missteps in how his administration had approached the talks. And, importantly, a joint statement about the call noted that “the two leaders have decided to open a process of in-depth consultations, aimed at creating the conditions for ensuring confidence and proposing concrete measures toward common objectives.”

Friday’s bilateral meeting marks an opportunity for those consultations to lead to concrete announcements, Célia Belin, a visiting fellow at the Center on the United States and Europe at The Brookings Institution, told CNN.

“The meeting between the two leaders will be the occasion to make some announcements and to see whether or not … this crisis was the occasion to define … a new common agenda, or if there are sort of long, lingering issues that cannot be addressed,” Belin told CNN.

Sullivan told reporters on Thursday that the Biden administration feels “very good about the intensive engagement that we’ve had with France over the course of the past few weeks,” noting his own recent visit to Paris, the President’s two calls with Macron since the submarines spat and Secretary of State Antony Blinken’s Paris trip.

“We’re eager to have the conversation tomorrow because the agenda really is overflowing,” Sullivan said. “There are so many issues in which we and France come from common values, common perspectives, common interests, and need to be aligned in terms of our policy approaches.”

The outrage in Paris over the subs agreement was dismissed by some in Washington, and Belin isn’t convinced that the US and France see the stakes of Friday’s meeting the same way.

“I can tell you it’s highly anticipated on the French side. I wonder if it’s highly anticipated on the other side,” Belin said, calling the dynamic “a reflection of the imbalance in a relationship.”

“One is the superpower. The other one is this strong middle power. But you have an imbalance. And for France, having a good relationship, or having a clear relationship, with the US — it’s also a condition, for instance, for influence in Europe,” she added.

There have been other rifts, too, such as the surprise over the deadly and chaotic US withdrawal from Afghanistan, which involved NATO allies, such as France.

Macron used the withdrawal to make the case for his larger vision for European global leadership — particularly its independence from US national security policy.

During a speech from Baghdad this summer, Macron remarked: “Whatever the American choice, we will maintain our presence to fight terrorism in Iraq as long as the terrorist groups continue to operate and as long as the Iraqi government asks us for this support.”

The meeting between the two leaders, which is clearly seeking to repair relations, comes just four months after their last summit with other world leaders in Europe, where Macron heaped praise on Biden and called him “part of the club.”

“I think that what you demonstrate is that leadership is partnership, and we do appreciate,” Macron said.

And asked at the time if allies think America is back, Biden looked at Macron and said, “Ask him,” to which Macron replied: “Definitely.”

The upcoming Macron meeting is a smaller part of a larger theme playing out as Biden returns to Europe for the summits.

Biden, who stepped into his presidency declaring that American diplomacy had returned following a period of Trump-led nationalism, returns to Europe for the second time since coming into office among a more skeptical group of world leaders.

Leaders attending the global summits in Europe in the coming days, such as Macron, have their own stakes.

The meeting comes ahead of France’s presidential election in April. Macron, who is seeking reelection, is on a charm offensive with voters. In June, his party performed poorly in regional elections, which were being closely watched ahead of the presidential vote next spring. However, given the low voter turnout, political experts said it was hard to draw conclusions.

France is assuming its six-month presidency of the European Union in January — marking a test for Macron’s larger vision. And with German Chancellor Angela Merkel’s imminent departure from office, Macron, if reelected, could stand to become the de facto dean of Europe.

CNN’s Simone Bouvier and Tara John contributed to this report.

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