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President Donald Trump has repeatedly floated the possibility of scrapping his Middle East travel schedule and adding a stop to personally mediate Ukraine-Russia peace talks in Turkey.

Ukraine challenged Russian President Vladimir Putin to join talks in Istanbul on Thursday and said if he failed to do so, it would show he was not serious about peace, and that the world should take a tougher stance against Russia.

Vladimir Putin and Volodymyr Zelensky could come face to face in Turkey this week - but it wouldn't be the first time the world leaders have met in person.