U.S. President Donald Trump, Danish Prime Minister Mette Frederiksen, and Greenlandic Prime Minister Jens-Frederik Nielsen signed a new security agreement on Tuesday, Sept. 22, 2026. The deal, signed at the United Nations headquarters, concludes a period of diplomatic tension resulting from U.S. interest in Greenland that began in late 2024.
Relations between the U.S. and Denmark were strained following U.S. military threats and expressions of interest in acquiring the territory. During the peak of the tension in January 2026, Prime Minister Nielsen stated that if forced to choose between the U.S. and Denmark, Greenland would choose Denmark and the NATO military alliance. The new agreement is intended to stabilize the relationship and ensure U.S. military access to the region.
The signed defense agreement is broader than the previous 1951 deal, though the U.S. already maintained extensive military access under the older terms. Greenlandic officials described the signing as a milestone for autonomy, as it marks the first time Greenland has entered into a binding international agreement as a country. Naaja Nathanielsen, a Greenlandic lawmaker, stated the move was a significant step toward self-autonomy.
Greenlanders will see a continued U.S. military presence, but the agreement also reinforces the island's path toward self-determination within the Kingdom of Denmark. The island, which was considered a colony until the early 1950s and gained self-rule in 2009, now has a direct seat at the table for foreign affairs previously managed by Denmark. This change follows a period of internal reconciliation, including a 2025 official apology from Denmark for historical abuses, such as the forced fitting of intrauterine devices (IUDs) in an estimated 4,500 women and girls between the 1960s and mid-1970s.
The long-term impact of the agreement depends on whether promised U.S. investments and contracts materialize. Observers note that the deal prevents adversarial countries, such as Russia, from gaining a foothold in the territory, which was a concern for the U.S. and NATO. While the immediate security crisis has subsided, leaders in Copenhagen and Nuuk are now evaluating how to maintain transatlantic ties following the recent instability.
What happens next: Following the signing on Sept. 22, 2026, the agreement enters into force as the new framework for U.S. operations in Greenland. Future steps involve the potential implementation of U.S. economic investments. However, officials have not yet provided specific dates for when new contracts or infrastructure projects will begin. The Greenlandic government continues to hold the right to seek full independence in the future under the existing Self-Government Act.