How could Canada, EU, NATO respond to a U.S. takeover of Greenland?

The possibility of a forceful U.S. takeover of Greenland is raising many unprecedented questions — including how Canada, the European Union and NATO could respond or even retaliate against an ostensible ally. A high-level meeting between Greenlandic, Danish and U.S. officials this week did not resolve the “fundamental disagreement” over the territory’s sovereignty but did set the stage for more talks. The White House made clear Thursday that U.S. President Donald Trump’s desire to control Greenland has not changed after the meeting. “He wants the United States to acquire Greenland. He thinks it’s in our best national security to do…