President Trump signed a trilateral security agreement with Denmark and Greenland on Tuesday during a ceremony held alongside the United Nations General Assembly in New York. The deal builds on the 1951 U.S.-Denmark Defense of Greenland Agreement and adds a more significant role for Greenland as a self-governing territory. It includes two new U.S. military bases, permanent U.S. access to Greenland’s security architecture and expanded rights at Pituffik Space Base, formerly Thule Air Base. The accord also bars non-NATO adversaries from establishing military bases or deploying personnel in Greenland and introduces screening for foreign investment in sensitive sectors, including critical minerals. It does not transfer Greenlandic territory to the United States. The signing ends a monthslong standoff that strained Washington’s relations with European allies after Trump threatened to take over the Arctic island.