Leaders of Denmark and Greenland insisted Thursday that the island's sovereignty was nonnegotiable after U.S. President Donald Trump said he had agreed with the NATO chief on the framework of a future Arctic security deal that Trump said would grant the U.

The prime minister says the "hard yards" of bolstering Arctic security can begin after the US president's shift.

Former NATO Secretary General and former Danish Prime Minister Anders Fogh Rasmussen warned Donald Trump that an attempt to conquer the Danish territory of Greenland would be the end of the Western alliance,

Danish lawmaker Anders Vistisen has gone viral for a heated speech to the European Parliament in which he told U.S. President Donald Trump to 'f--k off' over his threats to take over Greenland