Russia-Ukraine war: Key things to know about the conflict

Ukrainian President Volodymyr Zelenskyy has invoked Pearl Harbor and 9/11 during an urgent appeal to the U.S. Congress for more weapons to stem the Russian assault. U.S. President Joe Biden announced an additional $800 million for Ukraine’s military and said Russian President Vladimir Putin is a “war criminal.” In the encircled city of Mariupol, a Russian airstrike destroyed a theater where hundreds of people were sheltering. The extent of the casualties wasn’t clear. In Kyiv, missiles and artillery slammed into high-rise apartment towers, setting buildings ablaze and sending smoke over the capital and its suburbs.