“We choose Denmark over the United States if asked to make such a choice here and now.”

The words came from Jens-Frederik Nielsen, Prime Minister of Greenland, an autonomous Danish territory, during a joint press conference with Danish PM Mette Frederiksen in Copenhagen as U.S. President Donald Trump renewed his threats to annex the Arctic territory. The threat of a U.S. takeover receded after Mr. Trump said at Davos that he had agreed to a framework deal with European nations over Greenland, though he offered few details. But the crisis is far from over. With an unpredictable Mr. Trump insisting that the U.S. needs Greenland for ‘national and global security’, Mr. Nielsen, leader of the island’s 55,000 people, has been caught in the eye of a rare transatlantic geopolitical storm.