Steve Witkoff says Vladimir Putin agreed at his summit with Donald Trump to allow the U.S. and European allies to offer Ukraine a security guarantee resembling NATO’s collective defense mandate.

Steve Witkoff said it was the first time he had heard the Russian president agree to the suggestion - and called it "game-changing".

U.S. President Donald Trump could offer NATO-like protection of Ukraine, and Russia is open to the idea, one of his top foreign policy officials said on Sunday ahead of a meeting with Ukraine and European leaders to hammer out details of possible security guarantees for Kyiv.