I ll ask a top pentagon spokesman, john kirby, how these weapons might make a difference. our correspondents are standing by in ukraine with cnn s live global coverage as this war enters its ninth week. we want to welcome our viewers in the united states and around the world. i m wolf blitzer and you re in the situation room. this hour, we re following what could be a final showdown between russian and ukrainian forces in mariupol. a critical battleground in the war. there s also new satellite evidence emerging appearing to show mass graves outside that southeastern city. let s get the latest on the fight for mariupol. matt rivers has our report from the war zone. destroyed one tank today.