Zelenskyy invoked 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."Putin meanwhile warned against attempts by the West and his Russian opponents to bring about the "destruction of Russia," signaling an even greater crackdown on opposition to the war.He said Russians "will always be able to distinguish true patriots from scum and traitors and will simply spit them out like a gnat that accidentally flew into their mouths."A view of a building, damaged as a result of shelling of the city by Russian missiles in the center of Kharkiv, Ukraine. (Photo by Stringer/Anadolu Agency via Getty Images) The fighting has led more than 3 million people to flee Ukraine, the U.N.
estimates. The death toll remains unknown, though Ukraine has said thousands of civilians have died.Here are some key things to know about the conflict:Ukrainian Foreign Minister Dmytro Kuleba said the attack on the theater in Mariupol is a "horrendous war crime." Satellite imagery from the Maxar space technology firm showed the word "CHILDREN" written in large white letters in Russian in front of and behind the building.RUSSIANS INVADE UKRAINE — MARCH 14, 2022: 01 Maxar collected satellite imagery of Mariupol, Ukraine on March 14th that included the Mariupol Drama Theater which was bombed on March 16th.