U.S. President Donald Trump and Russian President Vladimir Putin will meet at a Cold War-era air force base in Alaska on Friday to discuss a ceasefire deal for Ukraine that the U.S. sees as a possible way to end the deadliest war in Europe since World War II.

Ukrainian President Volodymyr Zelenskyy, who was not invited to the talks, and his European allies fear Trump might sell out Ukraine by essentially freezing the conflict and recognizing — if only informally — Russian control over one fifth of Ukraine.

Both Trump and Putin are seeking wins from their first face-to-face talks since Trump returned to the White House.