It has become a truism to assert that Europe needs to fast-track its own strategic independence in a volatile world. A recent paper from the European Council on Foreign Relations describes the continent’s leaders as grappling with “a ‘Schrödinger’s NATO’ moment, in which America remains formally inside the alliance while behaving as though it were not, just as the Russian threat looms larger”. Donald Trump’s United States has become at best an unreliable and at times reluctant ally, as Vladimir Putin’s revanchist ambitions have exposed the need to strengthen Europe’s defences.

But if the goal of greater autonomy is to be achieved, far better coordination of resources and cooperation between national defence industries will be required. Neither has been much in evidence this month, with France and Germany abandoning a joint £100bn project to build a new fighter jet as part of an updated Future Combat Air System. Originally launched by Emmanuel Macron and........

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