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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.

Trump added that duties on those nations would rise to 25% on June 1 until “a Deal is reached for the Complete and Total purchase of Greenland.”