U.S. President Donald Trump lambasted Britain's deal to cede sovereignty of the Chagos Archipelago - including an island with an important U.S.-UK air base - as an act of "total weakness" and "great stupidity" that underlines why he wants to acquire Greenland.

A lease agreement modeled on Guantánamo Bay would be a win-win-win for the U.S., Greenland and Denmark.

The US president has pledged to tell European leaders at this week's forum in Davos, Switzerland, that "we will have to have" Greenland.