Since its founding nearly eight decades ago, Nato, the world’s mightiest military alliance, has rested on a confidence trick — an assumption that every member, and above all its pre-eminent one, the US, would defend an ally under attack.
That confidence had already been severely dented by Donald Trump’s repeated questioning of Nato’s usefulness and disavowal of America’s mutual defence obligations. This month it was shattered by Trump’s threats to seize Greenland from Denmark, a close Nato partner.
It is a seismic change that will force America’s bereft allies reluctantly to reimagine how they organise their own security.
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