The British prime minister, Keir Starmer, declared yesterday that “we are at a crossroads in history,” and announced that European countries would assemble a “coalition of the willing” to defend Ukraine against Russia. Read more here.

In a war dominated by the unexpected, few imagined Ukraine’s fourth year at war would so firmly now question the security of all of Europe.

British Prime Minister Keir Starmer has told leaders gathered Sunday for a summit on the war in Ukraine that they need to step up and continue to support Kyiv, and meet a “once in a generation moment”