Russian officials mocked Ukrainian President Volodymyr Zelensky after Russian President Vladimir Putin ignored his demand of a face-to-face meeting in Istanbul, Turkey, where the first direct Russia-Ukraine talks in more than three years are due to take place.

Putin's absence punctured hopes of a breakthrough in peace efforts that were given a push in recent months by the Trump administration and Western European leaders.

U.K. Prime Minister Keir Starmer accused Russian President Vladimir Putin of "dragging his feet" and obstructing peace efforts in Ukraine after Putin declined to attend face-to-face talks with Ukrainian President Volodymyr Zelensky in Turkey,