In spring 1941, Denmark’s ambassador signed a treaty giving the U.S. military access to Greenland to help protect the island from Nazi Germany.

"Greenland never has been for sale and never will be for sale," Aaja Chemnitz, one of two MPs in the Danish parliament representing Greenland, told CNBC.

NUUK: NATO and Greenland’s government on Monday said they intend to work on strengthening the defense of the Danish autonomous territory, hoping to dissuade US President Donald…