Denmark's prime minister, Mette Frederiksen, had a phone conversation with Donald Trump where she reiterated that Greenland is not for sale. Trump had previously described U.S. ownership of Greenland as an 'absolute necessity' and refused to rule out military and economic force to obtain it. Frederiksen emphasized the importance of strengthening security in the Arctic and stated that it is up to Greenland to decide on independence. Greenland already contributes to U.S. security and has a territorial relationship with a NATO ally. Trump's comments about Greenland have raised concerns about alienating a U.S. ally and have also led to discussions about the island's strategic importance and resources.