Special U.S. envoy Steve Witkoff says Russian leader Vladimir Putin agreed to allow the U.S. and Europe to offer Ukraine a security guarantee resembling NATO's collective defense mandate.

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Hungary accused Ukraine of an "outrageous and unacceptable" attack that disabled a Russian oil pipeline supplying the NATO ally—and fired a warning to Kyiv about its reliance on Hungarian electricity supplies. Newsweek has contacted the Ukrainian foreign ministry for comment.

The European political heavyweights expected in Washington are Macron, British Prime Minister Keir Starmer, German Chancellor Friedrich Merz, Italian Premier Giorgia Meloni, Finnish President Alexander Stubb, European Commission President Ursula von der Leyen, and NATO Secretary-General Mark Rutte.

European leaders will join Ukraine's President Volodymyr Zelenskyy for his crucial meeting with President Trump in Washington on Monday.

European and NATO leaders announced Sunday that they will joining President Volodymyr Zelensky in Washington for crucial talks with President Trump.