NEW YORK —

Russia's Vladimir Putin agreed at his summit with President Donald Trump to allow the United States and its European allies to offer Ukraine a security guarantee resembling NATO’s collective defense mandate as part of an eventual deal to end the 3 1/2-year war in Ukraine, special U.S. envoy Steve Witkoff said Sunday.

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“We were able to win the following concession: That the United States could offer Article 5-like protection , which is one of the real reasons why Ukraine wants to be in NATO," he told CNN's “State of the Union.” He added that it “was the first time we had ever heard the Russians agree to that” and called them “game-changing.”

Article 5 , at the he

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