For all Donald Trump’s bluster about restoring American strength, his attempt to bully European allies over Greenland reveals a deeper weakness: coercive diplomacy only works if people are afraid to resist. Increasingly, they aren’t. And that is a good thing. Bullies often back down when confronted – their power relies on fear. Mr Trump’s threat to impose sweeping tariffs on Europeans unless they acquiesce to his demand to “purchase” Greenland has stripped his trade policy bare. This is not about economic security, unfair trade or protecting American workers. It is about using tariffs as a weapon to force nations to submit.

The response from Europe has been united and swift. That in itself should send a message. France’s Emmanuel Macron says plainly “no amount of........

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