US President Donald Trump has said he had a "lengthy and highly productive" phone call with Vladimir Putin on Wednesday in which the leaders agreed to begin negotiations to end the war in Ukraine.

By Nandita Bose, Guy Faulconbridge and Tom Balmforth WASHINGTON/MOSCOW/KYIV (Reuters) -Donald Trump said both Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskiy expressed a desire for peace in separate phone calls with him on Wednesday,

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.