Donald Trump has always been an avowed transactionalist rather than a transatlanticist. The author of The Art of the Deal made it clear during his first term as US president that he thought Nato was a bad deal for the US. He publicly berated European allies, notably Germany, for not spending enough on defence and leaving the US to pick up the tab.
But with his Ukraine policy, Trump 2.0 is forcing Europeans to confront the previously unthinkable: an international order where the US is no longer an automatic ally of European security.
Lord Ismay, the first secretary-general of Nato, quipped that the purpose of the transatlantic alliance was to “keep the Soviet Union out, the Americans in, and the Germans down”. For the following decades, Nato worked pretty much as intended. It provided the political and organisational basis for a significant US military presence, including an active US nuclear deterrent.
