European leaders met in London to formulate a plan to help end the war in Ukraine. But even potential peacekeepers face political and economic hurdles.

European leaders sought to assemble what Britain called a “coalition of the willing” to secure Ukraine after any US-brokered ceasefire, as they gathered in London to coordinate defense spending hikes amid concerns of an American pullback.

"Not every nation will feel able to contribute," British Prime Minister Sir Keir Starmer said during a press conference on Sunday.

UK Prime Minister Keir Starmer and other European leaders used a security summit in London to demonstrate broad support for Ukraine. Behind the scenes, though, they were scrambling to get Volodymyr Zelenskiy back to the table with US President Donald Trump.

"Even while Russia talks about peace, they are continuing their relentless aggression," Starmer said at the meeting.

Ukraine will work with Europe to draw up a plan to “stop the fighting” with Russia before presenting a blueprint for peace to US President Donald Trump, UK Prime Minister Sir Keir Starmer said on Sunday.