London | UK Prime Minister Keir Starmer will barely get his feet under the desk in No. 10 Downing St. before he flies to Washington this week to attend a NATO summit. A week after that, he will play host to 50 European leaders at a security meeting at Blenheim Palace, the birthplace of Winston Churchill.

It is a crash course in global statecraft for Sir Keir, Britain’s first Labour prime minister in 14 years. But it will also give him the chance to project an image of Britain that is uncharacteristic in the post-Brexit era: a stable, conventional, centre-left country amid a churning tide of politically unsettled allies.