Donald Trump’s gambit to buy Greenland may sound ridiculous, but it’s not impossible. If the president-elect is really determined to control the world’s largest island, he could try to buy it outright if the autonomous territory declares independence from Denmark.

The Danish foreign minister expressed openness to working more closely with the U.S. to ensure its interests in the region are addressed after President-elect Donald Trump said he wants to buy the Danish territory of Greenland—but the foreign minister continued to cast doubt on Trump’s idea to acquire the island,