Lago on Tuesday, president-elect Donald Trump marked the starting shot in what could be a make-or-break test for NATO over Ukraine, Greenland, and defence spending.

Pituffik Space Base, located in the far north of Greenland since the end of the second world war, is home to 200 US military personnel and 450 other forces and contractors from allies, part of Washington’s missile early warning system as well as offering space surveillance and satellite command.

The U.S. president-elect has not ruled out trying to acquire the autonomous territory belonging to alliance member Denmark.