U.S. special envoy Steve Witkoff said on Sunday that Moscow has agreed to let the United States and a group of European nations extend “Article 5-like” security guarantees to Ukraine as part of negotiations to end the three-and-a-half-year war. Speaking on CNN two days after President Donald Trump’s summit with Vladimir Putin in Alaska, Witkoff called the pledge a “game-changing concession,” noting that Russia would enshrine in domestic law a commitment not to attack Ukraine or other countries once a peace deal is reached. U.S. Ambassador to NATO Matt Whitaker separately told CNBC that any such guarantee would amount to a new alliance outside the North Atlantic Treaty Organization, because NATO itself would not be a party. Whitaker said the framework—reportedly drafted during Hague-mediated talks—will define “possible outcomes” for Ukraine’s long-term security but still requires detailed work on enforcement and membership conditions. The proposed guarantees will be discussed at a White House meeting on Monday that will bring Ukrainian President Volodymyr Zelenskyy together with Trump and several European leaders. Diplomats caution that major obstacles remain, including the status of territories occupied by Russia and the mechanics of collective defence. Nevertheless, Witkoff argued the Alaska talks narrowed differences and opened a path to a broader peace agreement if Kyiv, Washington and Moscow can agree on the final terms.