US, Denmark, Greenland Sign Security Deal at UNGA; Denmark Says NATO Now Shares Arctic Responsibility

The United States, Denmark and Greenland signed their Arctic security agreement on the sidelines of the UN General Assembly in New York on September 21, 2026, closing out the dispute that began with Trump's threats to acquire Greenland by force. Danish Foreign Minister Lars Løkke Rasmussen said 'responsibility for security in the Arctic is not only Danish or American' and that it is now 'to a large extent' NATO 'that looks after the Arctic' — the clearest Danish attempt yet to reframe the deal as a multilateral alliance commitment rather than a bilateral US-Denmark or US-Greenland arrangement. Trump maintained the agreement gives Washington 'permanent control' over Greenland's security; Denmark and Greenland again did not directly rebut that characterization but emphasized sovereignty guarantees. The full text of the agreement was still not made public, and it remained unclear whether it formally amends the 1951 US-Danish defense agreement governing American bases on the island.