Special U.S. envoy Steve Witkoff said Sunday that Russian leader Vladimir Putin agreed at his summit with President Donald Trump to allow the U.S. and 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.

Former National Security Advisor Jake Sullivan disputes Secretary of State Marco Rubio's characterization that continuing negotiations with Russian President Putin are a step toward ending the war in Ukraine.

President Trump offered security guarantees to deter future Russian aggression. But the offer was vague, prompting Kyiv to seek clarity.

In the letter addressed to Putin, the first lady said he could "singlehandedly restore" the "melodic laughter" of children who have been caught in the conflict.

Volodymyr Zelenskiy flies to Washington on Monday under heavy U.S. pressure to agree to a swift end to Russia's war in Ukraine.

Trump promised during his campaign that he would end Russia’s war on Ukraine on his first day back in office, which is now 207 days ago.

Russian President Vladimir Putin invited US President Donald Trump to Moscow at the end of their joint press conference in Alaska.