Ukrainian Forces Try to Hold Mariupol as Combat Reaches City Streets

Government forces in Ukraine said they kept up the resistance Saturday. “Fierce battles between the defenders of Mariupol and the occupier continue, including on the city streets,” said a report on the Telegram channel of the volunteer group Azov Battalion, whose members have been fighting alongside regular government forces inside the city.

“The military repulses the enemy, who does not stop the attack on Mariupol with his artillery and aircraft,” the report said.

The capture of Mariupol would be a key victory for Russia, which has so far failed to take any major Ukrainian cities. It would free up its forces to encircle Ukrainian army units in eastern regions and push further toward the Ukrainian capital of Kyiv.

In the southern city of Mykolaiv, Russian missile strikes hit the headquarters of the Ukrainian army’s 79th brigade, including the quarters where officers’ families live. Several buildings collapsed and footage from the scene, broadcast on Ukrainian television channels, showed a small child being dug out from the rubble. Ukrainian officials say 40 people, and possibly more, have been killed.

Vitaliy Kim, the governor of Mykolaiv, said in a video recording that the “cowardly” Russian strike targeted sleeping soldiers, and that rescue operations at the site are under way. The Ukrainian military counteroffensive in the region is pressing ahead, he added.

As Russian forces have pounded Mariupol with airstrikes and artillery, the city has emerged as a symbol of tough Ukrainian resistance, as well as civilian suffering. Thousands of the city’s 400,000 have fled, and thousands have been killed, some dumped into mass graves, officials said.

Areas no longer controlled by Ukraine as of Friday

Direction of invasion forces

Controlled by or allied to Russia

Primary refugee crossing locations

Chernobyl

Not in operation

Ukraine territory, recognized by Putin as independent

Convtrolled by

separatists

Areas no longer controlled by Ukraine as of Friday

Direction of invasion forces

Controlled by or allied to Russia

Ukraine territory, recognized by Putin as independent

Primary refugee crossing locations

Chernobyl

Not in operation

Controlled by

separatists

Areas no longer controlled by Ukraine as of Friday

Direction of invasion forces

Controlled by or allied to Russia

Primary refugee crossing locations

Ukraine territory, recognized by Putin as independent

Chernobyl

Not in operation

Controlled by

separatists

Areas no longer controlled by Ukraine as of Friday

Direction of invasion forces

Controlled by or allied to Russia

Primary refugee crossing locations

Ukraine territory, recognized by Putin as independent

Areas no longer controlled by Ukraine as of Friday

Direction of invasion forces

Controlled by or allied to Russia

Primary refugee crossing locations

Ukraine territory, recognized by Putin as independent

Kyiv has tried to relieve Mariupol, so far unsuccessfully. Oleksiy Arestovych, an adviser to Ukraine’s president, said there was no way for Ukrainian forces to break Russia’s siege, addressing criticism the government isn’t doing enough.

Mariupol’s proximity to the Russian border means Moscow could easily bring massive air power to bear on it from nearby military hubs, such as Crimea and the southern Russian city of Rostov, he said.

The closest Ukrainian units to Mariupol are more than 100 kilometers (62 miles) away, he said, and the terrain around the city provides no cover from Russian attacks.

“No army in the world—even the U.S.—would make it that distance with the forces that we currently have there, unfortunately,” Mr. Arestovych said.

Ukraine’s President

Volodymyr Zelensky

said in his overnight address that 9,000 people have been evacuated from the city. Rescuers in Mariupol evacuated 130 people from the wreckage of a theater hit by an airstrike this week and searched for more survivors.

About 1,300 people remained trapped in the basement of the theater Friday, where residents had sought shelter from Russian shelling, said Lyudmyla Denisova, Ukraine’s human-rights commissioner, adding that it was difficult to be certain of the number of survivors. She didn’t confirm any casualties.

Russian President

Vladimir Putin

pledged to press on with his invasion of Ukraine in a rare public appearance Friday in front of a crowd of tens of thousands of flag-waving supporters in a Moscow stadium.

Parts of the Russian offensive have been bogged down by poor planning and logistics, and forces have encountered fierce Ukrainian counterattacks. Some of Russia’s ground advances stalled this week amid mounting casualties. Four Russian generals have died, the Ukrainian government says. Some U.S. government calculations estimate as many as 7,000 Russian troops have been killed in action, though officials caution those are uncertain estimates.

Yet, Moscow has been showcasing some of its high-tech weaponry with long-distance missile strikes. The Russian Defense Ministry said Saturday it fired an air-launched ballistic missile on Ukraine in what might have been the first use of the system Mr. Putin announced several years ago.

The weapon struck a large underground warehouse of missiles and aviation ammunition near Deliatyn in western Ukraine, the ministry said. Russian state media, RIA Novosti, said it was the first use of the new weapon.

Ukraine’s military confirmed a strike on the facility and that ammunition stored there was detonated. There was no information yet on the number of casualties or the type of weapon used, said Yuriy Ignat, spokesman for the Air Force of the Armed Forces of Ukraine.

“Unfortunately, Ukraine has become a testing ground for Russia’s entire arsenal of missiles,” said Mr. Ignat. “They use missiles that fly 2,000 kilometers, 5,500 kilometers.”

Mr. Zelensky said Russian forces “continue to block the supply of humanitarian aid to the besieged cities in most areas,” aside from the seven open humanitarian corridors. He added that more than 180,000 Ukrainians have been rescued and tons of essential supplies have been delivered. He also dropped all taxes and customs duties in an effort to expedite cargo entering the nation.

Mr. Zelensky called on Russia to negotiate and said that in the coming days he will address other nations like Switzerland, Israel, Italy and Japan, just like he did the U.S., Canada and Germany. “It’s time to meet. Time to talk. It is time to restore territorial integrity and justice for Ukraine,” he said. “Otherwise, Russia’s losses will be so huge that several generations won’t be enough to rebound…Ukraine’s proposals are on the table.”

President Biden spoke with Chinese leader

Xi Jinping

in a nearly two-hour videoconference on Friday, in an attempt to deter Beijing from deeper involvement with Moscow on its war effort.

“President Biden made clear the implication and consequences of China providing material support” to Russia, a senior U.S. official said after the call.

Mr. Xi sought to present China as a peacemaker. “The Ukraine crisis is something we don’t want to see,” he told Mr. Biden, according to China’s official Xinhua News Agency. “Conflict and confrontation are not in the interests of anyone.”

—Yaroslav Trofimov and Brett Forrest contributed to this article.

Write to Alan Cullison at alan.cullison@wsj.com and Isabel Coles at isabel.coles@wsj.com