At first glance, it doesn't seem to make any sense. The US president has deeply rattled Denmark by reiterating several times he may invade and occupy the semi-autonomous island of Greenland for "national security" reasons. But rather than looking at how it could bolster its national defenses against a possible — even if unlikely — incursion, the Danish parliament on June 11 overwhelming approved an agreement to let the US military enter the country whenever it wants, for whatever reason it sees fit.

"[T]he purpose of such presence of US forces is to further the efforts of the Parties to promote peace and security in the areas of mutual interest and benefit and to take part in common defense efforts," the Defense Cooperation Agreement (DCA) states. Some areas may even be put under the exclusive control of the US, although Greenland — which already hosts a US base — and the Faroe Islands are excluded.

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The DCA was drafted in 2023 with the Biden administration, at a time when transatlantic........

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