Prime Minister Keir Starmer wore a broad smile aboard the plane home from Washington. He landed back in Britain on Friday with the satisfaction of a tricky mission not quite accomplished, but off to a flying start.

Starmer's goals for his trip were to persuade President Donald Trump to provide Ukraine with security guarantees in any peace deal and head off duties on British goods while pursuing a rapport with an unpredictable U.S. leader who is the center-left prime minister's opposite in temperament and political outlook.