Denmark Prime Minister Mette Frederiksen said "you cannot spy against an ally" after reports that the U.S. was gathering intelligence on Greenland.

He has said the U.S. will take control of Greenland eventually and has not ruled out military intervention, alarming American allies, particularly Denmark. The U.S. has a military

U.S. officials have ordered spy agencies to ramp up efforts to gather intelligence on Greenland, according to two sources with knowledge of the matter, in a sign President Donald Trump apparently remains focused on acquiring the island.