Trump signs landmark Greenland security agreement with Denmark and Greenland

Wednesday 23 September 2026 - 09:15

United States President Donald Trump, Danish Prime Minister Mette Frederiksen and Greenlandic Prime Minister Jens-Frederik Nielsen signed a new trilateral security agreement on September 22, 2026, at United Nations headquarters in New York, opening a new chapter in the security arrangements surrounding Greenland.

The agreement strengthens the American military presence in the Arctic while reaffirming the sovereignty and territorial integrity of the Kingdom of Denmark and Greenland’s right to self-determination. The Danish government described the pact as a framework designed to reinforce security in the Arctic and North Atlantic within the NATO alliance.

At the heart of the arrangement is Washington’s long-term role in Greenland’s defense. The White House said the agreement gives the United States lasting control over security interests on the island and establishes permanent basing rights. The document itself states that the agreement has no end date and can only be amended by mutual consent.

Two new defense areas planned

The agreement provides for an expanded American military footprint at several locations. Washington will be able to modernize and enlarge its activities at Pituffik Space Base, while an additional defense area is to be established at Narsarsuaq in southern Greenland and Mestersvig on the island’s east coast.

The agreement also leaves open the possibility of creating further defense areas in Greenland. Any such expansion would require consultations and agreement between the parties under the procedures established by the accord.

The planned installations form part of a broader effort to strengthen surveillance, military mobility and defensive capabilities across the strategically important Arctic region.

Restricting rival military and strategic activity

Another central provision concerns the presence of states outside NATO. Under the agreement, non-NATO countries will not be permitted to establish military installations or maintain a persistent military presence in Greenland unless the parties agree otherwise.

The accord also introduces restrictions concerning foreign investment in particularly sensitive sectors. Investors from states outside NATO, the European Union and designated partner frameworks could be prevented from obtaining control, significant influence or access to sensitive information when such activities are considered a threat to national security or public order.

These provisions reflect the growing strategic importance of Greenland, situated between North America and Europe and increasingly central to Arctic defense planning.

The Golden Dome dimension

The agreement explicitly connects American military access in Greenland with plans for the Golden Dome defense system. The text recognizes the United States' interest in using Greenland to support measures intended to defend the North Atlantic Treaty area, Greenland and the American continent.

Trump presented the arrangement during his address to the United Nations General Assembly as part of a wider effort to strengthen the defense of North America. The White House said the agreement would ensure Washington's long-term ability to operate in Greenland for continental defense purposes.

Greenland remains under Danish sovereignty

Despite the expansion of American security responsibilities, the agreement does not transfer sovereignty over Greenland to the United States. The Danish government explicitly said the accord respects Denmark's sovereignty and territorial integrity as well as the Greenlandic people's right to self-determination.

The agreement also contains provisions addressing a possible future independence of Greenland. If Greenland becomes independent, the text requires the Danish and Greenlandic governments to ensure that the new state remains within NATO and assumes the rights and obligations established by the agreement.

The arrangement therefore establishes a long-term security framework without changing Greenland's present constitutional status.

Entry into force still requires parliamentary procedures

Although the agreement was signed in New York, it is not immediately operative in its entirety. The text specifies that it will enter into force after the necessary parliamentary procedures have been completed by Denmark together with Greenland.

The signing nevertheless marks a significant development in relations between Washington, Copenhagen and Nuuk. It formalizes an expanded American defense role in Greenland while placing the island more firmly within the broader NATO security architecture of the Arctic and North Atlantic.