U.S. Defense Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken speak with reporters after returning from their trip to Kyiv and meeting with Ukrainian President Volodymyr Zelenskiy, near the Ukraine border, in Poland, April 25, 2022. Alex Brandon/Pool via REUTERS 

U.S. Secretary of State Antony Blinken boards a plane to return to Washington after a trip with U.S. Secretary of Defense Lloyd Austin to Kyiv to meet with Ukrainian President Volodymyr Zelenskiy, near the Ukraine border, in Poland, April 25, 2022. Alex Brandon/Pool via REUTERS 

U.S. Secretary of State Antony Blinken and U.S. Secretary of Defense Lloyd Austin talk after speaking with reporters, after returning from their trip to Kyiv and meeting with Ukrainian President Volodymyr Zelenskiy, near the Ukraine border, in Poland, April 25, 2022. Alex Brandon/Pool via REUTERS 

U.S. Defense Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken speak with reporters after returning from their trip to Kyiv and meeting with Ukrainian President Volodymyr Zelenskiy, near the Ukraine border, in Poland, April 25, 2022. Alex Brandon/Pool via REUTERS TPX IMAGES OF THE DAY 

U.S. Defense Secretary Lloyd Austin and U.S. Secretary of State Antony Blinken speak with reporters after returning from their trip to Kyiv and meeting with Ukrainian President Volodymyr Zelenskiy, near the Ukraine border, in Poland, April 25, 2022. Alex Brandon/Pool via REUTERS