At the World Economic Forum in Davos, Switzerland, the prime minister was praised for his blunt talk about the president’s irrevocable “rupture” in the world order.

Prime Minister Keir Starmer stood firm over Greenland. But his center-left government and the country as a whole have been buffeted by President Trump.

In his first year back in office, Mr. Trump put his signature on more presidential directives than he did in his entire first ...