President Donald Trump says the US needs to "own" Greenland to prevent Russia and China from doing so. "Countries have to have ownership and you defend ownership, you don't defend leases and we'll have to defend Greenland," Trump told reporters on Friday.

Trump’s threat to annex an autonomous part of Denmark has plunged NATO into an unprecedented situation: An alliance based on collective defense now faces the prospect that one member might attack another.

But Trump’s obsession with taking Greenland is the kind of existential threat to European sovereignty that, in the eyes of some European officials and diplomats who spoke to POLITICO, demands a stronger response. The most they feel they could do to placate him is commit more troops.

The ice-covered island may be strategically important, but it's unclear that it could be a commercially viable source of minerals and oil in the near future

Veteran diplomat tells CBS News Denmark "ready to cooperate" on Greenland, and he expects U.S. to abandon "anachronistic approach of colonialism" post-Trump.

The U.S. needs to own Greenland to prevent Russia or China from occupying it in the future, President Donald Trump said on Friday.

Trump’s refusal to rule out force over Greenland revives tensions with Denmark and raises questions about whether the threat is leverage or a real shift in U.S. strategy toward allies.

Greenland is 836,000 square miles of largely frozen ground northeast of Canada. So why does the White House say it "should be part of the United States"?