When Donald Trump hosted Sanae Takaichi, the Japanese prime minister, last month, he could not resist a gratuitous reference to Pearl Harbor. The US president is impelled to trash longstanding alliances. He has done more than anyone to demolish the postwar global order.

This week alone, the Polish president, Donald Tusk, questioned whether the US would be “loyal” to Nato if Russia attacked. A Pentagon memo reportedly floated suspending Spain from Nato and reviewing support for the British claim to sovereignty over the Falkland Islands. And a report said US officials believe that it has depleted munitions so rapidly in Iran as to put in question contingency plans to defend Taiwan against a Chinese invasion in the near future.

But the outlines of the new world being built in response to authoritarian menace and US unpredictability also came a little........

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