President-elect Trump's talk of Canada as a "51st state" and annexing Greenland registered among national-security crowds as an "Oh, boy!" moment. Obnoxious, enticing, familiar. Why it matters: The darlings of Trump's current foreign policy fixation boast Arctic utility at a time when the icy region is heating up.

Denmark's Prime Minister Mette Frederiksen said on Wednesday she had spoken on the phone with U.S. President-elect Donald Trump and told him that it is up to Greenland itself to decide on any independence.