President Joe Biden announced $800 million in additional U.S. military aid for Ukraine and the European Union agreed to provide more cash for weapons, as Russia repositions its forces for renewed attacks in eastern and southern parts of its neighbor.

A report by the Organization for Security and Co-operation in Europe said Russia’s military committed war crimes by targeting civilians, while the mayor of Mariupol said the siege of the city has left more than 20,000 people dead.