President Joe Biden extends invitation to Ukrainian President Volodymyr Zelensky for crucial meeting at White House. Meeting aims to address urgent needs of Ukraine as it confronts Russian invasion, highlighting essential role of continued U.S. support. Key issues include defense cooperation, joint projects on weapons production, air defense systems, and securing unity among U.S., Europe, and world in supporting Ukraine's defense. Republican senators block $106 billion emergency aid package for Ukraine and Israel, causing concerns about potential for further Russian aggression.