NEW YORK/COPENHAGEN, Sep 22 – President Donald Trump is set to meet the leaders of Denmark and Greenland in New York on Tuesday for the signing of a security agreement that is expected to expand the U.S. military presence on the strategically important Arctic island while leaving Greenland under Danish sovereignty.
The agreement, negotiated after months of tension between Washington, Copenhagen and Nuuk, is intended to establish a new framework for U.S. military operations in Greenland and address American concerns over security in the Arctic and North Atlantic. The signing is scheduled to take place on the sidelines of the United Nations General Assembly, bringing Trump together with Danish Prime Minister Mette Frederiksen and Greenland Prime Minister Jens-Frederik Nielsen.
The arrangement could mark a significant change in the military posture of the United States in Greenland. While the island already hosts the U.S. Pituffik Space Base, the new agreement is expected to allow American forces to establish or expand operations at two additional locations, Narsarsuaq in southern Greenland and Mestersvig on the island’s east coast.
New military presence under a broader Arctic security framework
Narsarsuaq was once home to a major American airbase during the Cold War. The installation was closed by the United States decades ago, and the surrounding community has since become much smaller. Mestersvig, meanwhile, is currently associated with Denmark’s Sirius Dog Sled Patrol, an elite military unit responsible for surveillance and patrol duties across remote parts of Greenland.
The planned expansion would represent the largest increase in American military infrastructure on Greenland in decades. During the Cold War, the United States maintained a much larger network of facilities across the island, with as many as 17 installations and more than 10,000 personnel at its peak.
Today, the American military presence is centered on Pituffik Space Base in northwestern Greenland. The facility plays an important role in missile warning, missile defense and space surveillance, giving Washington a strategic position between North America and Europe.
The new arrangement comes after an unusually tense period in relations between the United States and Denmark. Trump has repeatedly described Greenland as strategically important to American national security because of its location, mineral resources and position along Arctic routes. His earlier comments about potentially acquiring the territory, including his refusal to rule out economic or military pressure, caused alarm in Denmark and Greenland and raised concerns among other NATO members.
Greenland is an autonomous territory within the Kingdom of Denmark. It has its own government and parliament and has broad authority over domestic affairs, while Copenhagen retains responsibility for areas including foreign policy and defense. Greenland’s political leadership has repeatedly emphasized its right to determine its own future.
The latest agreement appears to move the dispute away from the question of territorial ownership and toward military and security cooperation.
Trump has described the agreement in much broader terms. On Friday, he said it would give the United States “permanent control over security, and all other needs, in Greenland.” Danish officials have not adopted the same description of the arrangement.
Danish Foreign Minister Lars Løkke Rasmussen has instead emphasized that Arctic security should be treated as a responsibility shared through NATO. He has said the agreement would place Arctic security under the alliance’s collective framework rather than leaving responsibility solely with Washington and Copenhagen.
That distinction is central to how the deal is being presented in Denmark. The government has stressed that the agreement does not transfer sovereignty over Greenland to the United States and that the territory’s right to self-determination remains intact.
Frederiksen also framed the agreement as a security arrangement rather than a change in ownership. Speaking in New York on Monday, she said the reason the three sides could reach an agreement was that it concerned security policy and could serve Greenlandic, American and European interests as well as the wider Kingdom of Denmark.
Nielsen has likewise supported the principle of reaching an agreement focused on security and Greenland’s future, although the precise details of the pact have not been publicly released.
The lack of a published text means important questions remain unanswered ahead of the signing ceremony. It is not yet clear exactly how the new agreement will interact with the 1951 defense arrangement between the United States and Denmark, which has provided the legal foundation for the American military presence on Greenland for decades.
The details surrounding the proposed military sites are also expected to become clearer once the agreement is formally signed. The expansion could give the United States greater flexibility to operate across Greenland while allowing Denmark and NATO to retain a formal role in the island’s wider defense framework.
The agreement also carries significance beyond Greenland itself. The Arctic has become increasingly important to the United States, Russia, Canada, Denmark and other countries as melting sea ice opens new maritime routes and increases interest in the region’s natural resources and strategic geography.
Greenland’s position makes it particularly important to American and European defense planning. The island lies between North America and Europe and is close to routes connecting the Atlantic and Arctic regions. Its territory also contains substantial mineral and energy resources, although development is complicated by its remote geography, harsh climate and limited infrastructure.
For Denmark, the agreement could provide a way to strengthen the military defense of Greenland while keeping the issue within the NATO alliance. For Washington, expanded access would increase the U.S. military’s ability to monitor the Arctic and respond to potential threats.
For Greenland, the central issue remains the preservation of its political authority and its long-term path toward greater autonomy or possible independence.
The agreement therefore does not erase the disagreements that produced the Arctic standoff. Instead, it establishes a new arrangement in which the United States would gain a larger military role while Denmark and Greenland continue to assert their sovereignty.
Trump’s meeting with Frederiksen and Nielsen at the U.N. General Assembly is expected to formally put that arrangement into effect, although parliamentary approval in Denmark and Greenland may still be required before all parts of the agreement can be implemented.
The signing will be closely watched by NATO allies as they assess whether the new framework can ease the tensions created by Trump’s earlier campaign to bring Greenland under American control. It will also provide an early indication of how Washington, Copenhagen and Nuuk intend to manage the rapidly growing strategic importance of the Arctic.