European leaders met in London to form 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.

European leaders closed ranks Sunday in support of Kyiv at a London summit, where they pledged to spend more on security and assemble a coalition to defend any truce in