What Keir Starmer's resignation means for European security

British Prime Minister Keir Starmer announced his resignation on June 24, 2026, a move that has elicited gratitude from European leaders for his support of Ukraine and revitalization of EU-UK relations. Starmer was a key figure in the "coalition of the willing" providing military aid to Ukraine and in the E3 format coordinating foreign policy, though his successor will face challenges in defense spending and maintaining momentum.