British Prime Minister Keir Starmer said on Sunday European leaders had agreed to draw up a Ukraine peace plan to present to the United States, a vital step for Washington to be able to offer security guarantees that Kyiv says are essential to deter Russia.

At a summit in London just two days after Volodymyr Zelenskiy clashed with U.S. President Donald Trump and cut short a visit to Washington, European leaders offered a strong show of support to the Ukrainian president and promised to do more to help his nation, Reuters reported.

European leaders agreed they must spend more on defense to show Trump the continent can protect itself, and the European Commission chief suggested the bloc could ease rules that limit debt levels.

Starmer, who welcomed a visibly shaken Zelenskiy on Saturday with a warm hug, said Britain, Ukraine, France and some other nations would form a "coalition of the willing" and draw up a peace plan to take to Trump.

"This is not a moment for more talk. It's time to act. Time to step up and lead and to unite around a new plan for a just and enduring peace," Starmer said.

Leaders did not provide details of their plan. Before the summit, French President Emmanuel Macron told newspaper Le Figaro that the plan would involve a one-month ceasefire that would apply to air and sea attacks but not to ground combat.

European troops would be deployed if a more substantial peace agreement was reached, he said. It was not clear whether other nations had agreed to the terms.

Zelenskiy said after the meeting that he left London with "Europe's clear support" and readiness to cooperate.

"There will be diplomacy for the sake of peace," he said in his nightly video address. "And for the sake of us all being together - Ukraine, all of Europe and definitely, definitely America."