Ukrainian President Volodymyr Zelenskiy is embraced by U.S. President Joe Biden in the Oval Office of the White House in Washington, September 21, 2023. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY

US President Joe Biden and Ukrainian President Volodymyr Zelenskiy walk through the colonnade to the Oval Office at the White House in Washington, DC, on September 21, 2023. JIM WATSON/Pool via REUTERS

U.S. President Joe Biden and first lady Jill Biden pose with Ukrainian President Volodymyr Zelenskiy and his wife Olena as they greet them upon their arrival at the White House in Washington, U.S., September 21, 2023. REUTERS/Kevin Lamarque

Ukrainian President Volodymyr Zelenskiy is escorted by U.S. Senate Minority Leader Mitch McConnell (R-KY) and Senate Majority Leader Chuck Schumer (D-NY) as he departs after a meeting with all members of the Senate on a visit to the U.S. Capitol in Washington, September 21, 2023. REUTERS/Evelyn Hockstein

Ukrainian President Volodymyr Zelenskiy is flanked by members of his delegation including Ukrainian Foreign Minister Dmytro Kuleba, as he is greeted by U.S. Senators Jon Ossof (D-GA), Susan Collins (R-ME) and other senators after a meeting with all members of the U.S. Senate on a visit to the Capitol in Washington, U.S., September 21, 2023. REUTERS/Evelyn Hockstein

U.S. President Joe Biden meets with Ukrainian President Volodymyr Zelenskiy in the Oval Office of the White House in Washington, September 21, 2023. REUTERS/Kevin Lamarque

Ukrainian President Volodymyr Zelenskiy walks down the White House colonnade to the Oval Office with U.S. President Joe Biden during a visit to the White House in Washington, U.S., September 21, 2023. REUTERS/Kevin Lamarque/Pool

U.S. Secretary of Defense Lloyd Austin, U.S. Chairman of the Joint Chiefs of Staff General Mark A. Milley, Ukrainian President Volodymyr Zelenskiy and his wife Olena attend a wreath laying ceremony at the National 9/11 Pentagon Memorial, in Arlington, Virginia, U.S., September 21, 2023. REUTERS/Elizabeth Frantz

U.S. President Joe Biden and first lady Jill Biden welcome Ukrainian President Volodymyr Zelenskiy and his wife Olena as they arrive at the White House in Washington, U.S., September 21, 2023. REUTERS/Elizabeth Frantz

U.S. President Joe Biden and first lady Jill Biden welcome Ukrainian President Volodymyr Zelenskiy and his wife Olena as they arrive at the White House in Washington, U.S., September 21, 2023. REUTERS/Elizabeth Frantz

A framed flag signed by front-line Ukrainian fighters in Bakhmut and presented to the U.S. Congress in 2022, sits at one end of the table where Ukrainian President Volodymyr Zelenskiy will meet privately with U.S. House Speaker Kevin McCarthy (R-CA) and other congressional leaders on a visit to the U.S. Capitol in Washington, September 21, 2023. REUTERS/Jonathan Ernst

U.S. President Joe Biden meets with Ukrainian President Volodymyr Zelenskiy in the Oval Office of the White House in Washington, September 21, 2023. REUTERS/Kevin Lamarque

U.S. President Joe Biden and first lady Jill Biden welcome Ukrainian President Volodymyr Zelenskiy as he arrives on the South Lawn of the White House in Washington, U.S., September 21, 2023. REUTERS/Kevin Lamarque