Russia and Ukraine agreed to exchange 1,000 prisoners of war each during peace talks held in Istanbul on Friday, in what would be the biggest prisoner swap of the conflict. The negotiations, which lasted less than two hours and were mediated by Turkey,

Russia and Ukraine have agreed to the largest prisoner of war swap since the start of the war, The Associated Press reported Friday.

President Donald Trump has grown "frustrated" with Russian leader Vladimir Putin and Ukrainian President Volodymyr Zelenskyy, the White House said Monday ahead of separate calls Trump is holding in hopes of making progress toward a ceasefire in the war in Ukraine.