Ukraine’s President Volodymyr Zelensky raised the stakes ahead of a potential meeting with Vladimir Putin in Turkey on Thursday by saying he wouldn’t hold talks with any Russian representative other than the president himself.

Putin hasn't yet said whether he will be at the talks, which Trump has urged Ukraine and Russia to attend as part of Washington's efforts to stop the fighting.

Russia has not yet said who it will send to Istanbul on Thursday and has refused to respond to ultimatums.