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If economic sanctions are designed to apply pressure without firing a shot, then U.S. President Donald Trump has aimed directly at America’s closest military allies.

Trump said Saturday the U.S. will impose a 10% tariff on imports from eight NATO nations — Denmark, Norway, Sweden, France, Germany, the United Kingdom, the Netherlands and Finland — starting Feb. 1.

In a Truth Social post, Trump suggested that those countries were being penalized for sending troops to Greenland for a joint military exercise, writing that they had “journeyed to Greenland, for purposes unknown.”