Donald Trump would regret leaving NATO

Donald Trump has yet again raised the prospect of the United States leaving Nato. The US president called the alliance a ‘paper tiger’ and said he ‘was never swayed by Nato’. It is tempting to dismiss it as political theatre. But this time feels different. Trump’s frustration with European allies has sharpened, particularly over their reluctance to back his approach to Iran, where the absence of a clear political end-state has made support difficult to sustain. That hesitation has deepened transatlantic irritation. Combined with tensions over Greenland and Denmark, this is no longer an abstract complaint about burden-sharing but an...