The new prime minister of the United Kingdom, Rishi Sunak, is earning laurels from the New York Times for refusing to describe the country of which he is ostensibly the leader as “Global Britain.” That slogan is the brainchild of Boris Johnson, an after-a-fashion partisan of the right-of-center idea that Britain has a major role to play on the world stage. In this post-Brexit contretemps, our sentiments are with Mr. Johnson.