If Trump gives in to his desire to acquire Greenland, markets could react badly to the symbolic — and possible concrete — fracturing of the NATO partnership.

President Donald Trump has repeatedly talked about annexing Greenland. He reupped those calls hours after the U.S. captured Venezuela's leader.

“I would therefore strongly urge the U.S. to stop threatening a historically close ally and another country and people who have made it very clear that they are not for sale.”