In the long contest over the Arctic's future, the United States has moved to formalize what ambition has long implied: a permanent hand over Greenland's security. President Trump announced a trilateral defense pact with Denmark and Greenland that would bar foreign adversaries from establishing military footholds on the island without Washington's written consent. The agreement, framed by Copenhagen and Nuuk as a safeguard of sovereignty rather than a surrender of it, awaits parliamentary approval in both capitals before it can pass from declaration into law.