President Donald Trump’s announcement that he and Russian President Vladimir Putin had agreed to begin negotiations on ending the war in Ukraine followed a prisoner swap between the two nations.

National Security Advisor Mike Waltz said in a statement that Marc Fogel, who had been detained in Russia for more than three years, was leaving Russia today.

U.S. teacher Marc Fogel is freed by Russia in what the White House deems a diplomatic thaw that could boost negotiations to end the war in Ukraine.