“A new era is upon us.” Ursula von der Leyen was not holding back. This is a world turned upside down, changed beyond recognition. Leaders across Europe are echoing the alarm sent out by the European Commission president, and rippling across the continent, Canada and elsewhere: that we face a “clear and present danger on a scale that none of us has seen in our adult lifetime”. She has proposed a plan that would offer €800bn (£660bn) for immediate rearming, with a European sky shield to protect Ukraine.

The hooligan Russian asset in the White House has changed everything so profoundly that it is hard to keep track. The US, whose coat-tails we clung to, whose culture we revelled in, whose cleverness dazzled and stupidity confounded, is now the enemy. The shock feels viscerally personal because American culture is deep in our veins at all ages, from Sesame Street to Marvel, from Philip Roth to Philip Glass, the Oscars to Silicon Valley, like it or not. In Iraq and Afghanistan, we obediently followed their blunders, and 642 British soldiers died, as Keir Starmer adroitly reminded JD Vance in parliament. Our glamorous friend has turned fiend. How do we cauterise that off us? Or reconfigure the map of the world in terms of friends and foes?

Former UK ambassadors to Washington ruminated over this “seismic” shift, which has shaken every norm from their Foreign Office days. “This is not a blip in the relationship, something fundamental is going on,” one old knight

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