In a display of unity, Zelenskyy and the European leaders stressed the importance of security guarantees in a peace deal, which Mr. Trump said could come with U.S. coordination.

NATO military leaders are expected to meet on Wednesday to discuss Ukraine and the way forward, U.S. and NATO officials said on Tuesday, as Washington and European capitals work out details of what s...

Trump said that while Europe was willing to commit troops in some form, the United States would not, although it could provide other assistance.