The leaders of Britain and France are spearheading a desperate diplomatic drive to shore up Europe’s security, bolster Ukraine’s defenses and ensure the Trump administration doesn’t seek a ceasefire on terms that reward Moscow for invading its neighbor.

British Prime Minister Keir Starmer urged European leaders to strengthen their borders and support Ukraine, outlining a plan to end Russia’s war. Speaking at a summit in London, Starmer emphasized the need for collective responsibility and what he called a coalition of the willing to defend Ukraine.