The US president took the opportunity of a prime-time speech to the US public on April 1 to repeat his by now-familiar criticism of America’s Nato allies for not joining the war in Iran. He told them to “build up some delayed courage. Should have done it before. Should have done it with us as we asked.”

Trump’s anger at Nato in the past fortnight has been focused on the reluctance of the likes of the UK, Germany and France to land a hand in forcing Iran to open the Strait of Hormuz. This vital waterway, through which ordinarily one-fifth of the world’s oil and gas transits, has been effectively closed by the threat from Iranian missile strikes to all but a few tankers approved by Tehran. The result has been dramatic, as energy prices have rocketed and supplies to countries dependent on Gulf oil have rapidly diminished.

The US-Israeli assault on Iran has failed to topple the regime or curtail its ability to pose a security threat in the region, leaving Tehran to wreak economic havoc. This flies in the face of the Trump administration’s claims of the overwhelming success of Operation Epic Fury. So the US president and his national security team are, at least in part, blaming Nato’s reluctance to get involved.

It’s important to stress that Article 5 of the Nato treaty mandates that Nato members must come to the aid of any fellow member which comes under attack. In the case of the US-Israeli........

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