The United States and Russia agreed to “start negotiations immediately” to end Russia’s war in Ukraine, President Donald Trump said following a conversation with Russian President Vladimir Putin on Wednesday.

WASHINGTON (AP) — President Donald Trump upended three years of U.S. policy toward Ukraine on Wednesday, saying that he and Russian President Vladimir Putin had agreed to begin negotiations on ending the war following a dramatic prisoner swap.

The president said in a social media post Wednesday disclosing a call between the two leaders that they would “work together, very closely.”