White House says President Donald Trump still wants to buy Greenland, but has said military means are an option, too.

As Donald Trump revives talk of acquiring Greenland, here's explaining on whether the US can legally buy the island, what international law allows, and why Europe is pushing back

The sparsely-populated Arctic territory is mineral-rich, and the U.S.'s Pituffik Space Base on the northwest of the island is key for detecting any long-range missiles bound for the U.S. mainland. Danish and Greenlandic officials have repeatedly hit back at U.S. overtures toward the territory.