Ukraine has expressed concern at the level of security guarantees against Russian aggression in a U.S. proposal. President Donald Trump has said part of a peace deal could see Kyiv barred from joining NATO. Zelensky's comments suggest that Ukraine can benefit from security guarantees outside of the alliance's mutual defense pact.

The president said he has a "deadline" in mind for talks to make progress, though he did not say what it was. Trump administration officials say they had initially hoped to have secured a negotiated settlement before the 100th day of the president's second term next Tuesday, but that that goal now seems like a pipedream.