The British prime minister, Keir Starmer, presented President Trump with a royal invitation and scored several political wins. But his top goal — a security guarantee for Ukraine — remained elusive.

Trump, visibly pleased, examined the letter, signed “Charles R” in a bold, striking script. “A beautiful man, a wonderful man ...

Analysis The Significance of King Charles’s ‘Unprecedented’ Royal Letter to Trump Keir Starmer, Britain’s prime minister, gave President Trump an invitation and scored political wins.