European leaders raced Sunday to salvage Ukraine's ruptured relationship with the United States, with Britain and France assembling a "coalition of the willing" to develop a plan for ending Ukraine's war with Russia. They hope this effort will win the backing of a skeptical President Donald Trump.Gathering in London at the invitation of British Prime Minister Keir Starmer, the leaders vowed to bolster support for Ukrainian President Volodymyr Zelenskyy after his bitter clash with Trump last week. But several also expressed hope that the two could repair their breach, underscoring Europe's reluctance to cast off a trans-Atlantic alliance that has kept the peace for 80 years.