Biden, who took office last year after a violently contested election, vowed to restore democracy at home and unite democracies abroad to confront autocrats including the Russian president and China’s leader, Xi Jinping.
Putin’s 24 February invasion of Ukraine, which Russia calls a “special operation”, has tested that promise and threatened to inaugurate a new cold war three decades after the Soviet Union unravelled.
In what US officials were billing as a major address in Poland, Biden “will deliver remarks on the united efforts of the free world to support the people of Ukraine, hold Russia accountable for its brutal war and defend a future that is rooted in democratic principles”, the White House said in a statement.