Ukraine's President Volodymyr Zelenskyy leaves Downing Street after meeting with Britain's Prime Minister Keir Starmer in London, Friday, July 19, 2024. (AP Photo/Kin Cheung)

Britain's Prime Minister Sir Keir Starmer, left, and Ukrainian President Volodymyr Zelenskyy, right, look on as U.S. President Joe Biden speaks during an event on the Ukraine Compact at the NATO Summit at the Walter E. Washington Convention Center, in Washington, Thursday, July 11, 2024. Biden launched the Ukraine Compact, signed by 25 countries and the European Union, as part of a commitment to Ukraine's long term security. (Stefan Rousseau/Pool Photo via AP)

Vice President Kamala Harris arrives to speak from the South Lawn of the White House in Washington, Monday, July 22, 2024, during an event with NCAA college athletes. This is her first public appearance since President Joe Biden endorsed her to be the next presidential nominee of the Democratic Party. (AP Photo/Alex Brandon)

Russian President Vladimir Putin listens to RusHydro Director General Viktor Khmarin during their meeting at the Kremlin in Moscow, Russia, Monday, July 22, 2024. (Vyacheslav Prokofyev, Sputnik, Kremlin Pool Photo via AP)