By Naeema Saleem — SCN News
COPENHAGEN/NEW YORK, Sept. 22 — The United States is preparing its biggest expansion of military infrastructure in Greenland since the Cold War under a new security agreement with Denmark and Greenland that will allow Washington to establish two additional defence areas, expand its existing Pituffik Space Base and potentially deploy elements of President Donald Trump’s proposed “Golden Dome” missile-defence system on the strategically located Arctic island. The agreement gives Washington significantly broader military access, but it does not transfer Greenland to the United States or remove Danish sovereignty over the territory.
Trump signed the agreement at United Nations headquarters in New York on Tuesday alongside Danish Prime Minister Mette Frederiksen and Greenlandic Prime Minister Jens-Frederik Nielsen, bringing months of unusually tense negotiations over Greenland closer to a settlement. Frederiksen said the accord respected the sovereignty and territorial integrity of the Kingdom of Denmark and Greenlanders' right to self-determination, while Nielsen described stronger NATO security in the Arctic as essential. The agreement must still complete the necessary national parliamentary procedures before entering into force.
The two new American military sites are expected at Narsarsuaq in southern Greenland and Mestersvig on Greenland's east coast. Narsarsuaq hosted the major U.S. airfield Bluie West One during World War Two and later played a role during the Cold War, while Mestersvig is currently used by Denmark's Sirius Dog Sled Patrol. Washington will also be permitted to modernise and expand operations at Pituffik Space Base in northwestern Greenland, which is currently the United States' only active military installation on the island.
The expansion represents a significant reversal of the military contraction that followed the Cold War. At its peak, the United States operated 17 installations and stationed more than 10,000 personnel in Greenland. Most disappeared as the perceived Soviet threat receded, leaving Pituffik — formerly known as Thule Air Base — as the principal remaining American military presence. The return to multiple locations reflects Washington's assessment that the Arctic has again become strategically contested.
Why does Greenland matter so much?
Geography explains much of Washington's interest. Greenland sits between North America and Europe, with the Arctic providing one of the shortest potential routes for missiles travelling between Russia and the United States. That makes the island valuable for missile warning, space surveillance, communications and tracking threats approaching North America from the north.
Pituffik already performs important missile-warning and space-surveillance functions for the United States and NATO. Under the new agreement, Washington can modernise and expand activities there while creating additional defence areas farther south and east. The treaty explicitly says the objective is to defend Greenland, the NATO treaty area and the American continent.
Climate change is adding another strategic dimension. Retreating Arctic sea ice is increasing the potential accessibility of northern shipping routes and resources, giving Russia, China, the United States and European Arctic states stronger economic and security incentives to operate in the region. Russia possesses the Arctic's largest military infrastructure, while China has described itself as a “near-Arctic state” and sought greater economic and scientific involvement across the region.
Washington increasingly views those developments through a North American defence lens rather than regarding Greenland simply as a remote European territory. The new agreement therefore attempts to place Greenland more firmly inside an integrated U.S.-NATO Arctic security architecture.
What exactly has Denmark and Greenland agreed to?
The published treaty is considerably broader than simply allowing construction of two bases. It amends and supplements the 1951 Defence of Greenland Agreement, which has provided the legal foundation for the American military presence for 75 years. The updated framework explicitly authorises expansion at Pituffik and creates additional U.S. defence areas at Narsarsuaq and Mestersvig, although technical details concerning those sites still require agreement among the parties.
U.S. military aircraft and vessels receive extensive mobility rights. American forces will be able to move between designated defence areas through Greenland by land, sea and air. The agreement says U.S. military aircraft may fly over and land in Greenland and American public vessels may have undersea access and movement within Greenlandic territorial waters, subject to conditions agreed among the parties.
Washington could eventually seek more sites as well. Either side may identify a requirement for another defence area, but the United States cannot simply establish one unilaterally. A proposal must specify its location, size, scope and intended activities and then go through consultations with Denmark and Greenland.
That qualification is important because Trump's description of the agreement has been considerably more expansive. Speaking at the UN, he said it gave the United States “permanent control” over security in Greenland. The actual treaty preserves a trilateral framework involving the United States, Denmark and Greenland and expressly operates within existing agreements rather than transferring territorial sovereignty. Frederiksen publicly stressed that Danish sovereignty and Greenlandic self-determination remain protected.
Is Trump getting the Greenland takeover he originally wanted?
No.
Trump repeatedly argued that the United States should acquire Greenland and earlier refused to rule out economic or military pressure, triggering a serious diplomatic dispute with Denmark and opposition in Greenland. Tuesday's agreement represents a different outcome: Greenland remains a self-governing territory within the Kingdom of Denmark while Washington receives substantially expanded military access.
That distinction appears to have provided the political compromise required to end the standoff. Washington gets much of the strategic military access it argued was necessary without obtaining sovereignty, while Denmark and Greenland retain territorial control and secure explicit recognition of Greenlanders' right to self-determination.
The result effectively separates two questions that had become entangled during the dispute: who owns Greenland and who helps defend it. The first remains unchanged. The second is shifting significantly toward a larger American and NATO military role.
What is the Golden Dome connection?
One of the most important provisions explicitly allows U.S. access necessary to establish a Golden Dome defence system in Greenland. Trump has promoted Golden Dome as a multilayered American missile-defence architecture intended to detect and intercept ballistic and other advanced missile threats before they reach the United States.
Greenland's position makes it potentially important to such a system because missile trajectories from parts of Russia toward North America can cross the Arctic. Sensors positioned there could contribute to early warning, tracking and potentially broader interception architecture.
The treaty does not mean a complete Golden Dome network has already been built in Greenland. It creates the legal and military framework allowing deployment and supporting infrastructure. The eventual scale, equipment, cost and construction timetable will depend on subsequent implementation decisions.
What does the agreement mean for Russia?
Russia is the most immediate military factor behind NATO's growing Arctic focus. Moscow possesses extensive Arctic territory, airfields, radar installations, naval facilities and nuclear forces, including its Northern Fleet. Greenland's location gives NATO a strategically important position between Russia's Arctic approaches, the North Atlantic and North America.
The Kremlin responded cautiously on Tuesday. It said the agreement was a matter for the United States, Denmark and Greenland and noted that Arctic cooperation between Moscow and Washington was not currently on the agenda. That response avoids an immediate confrontation over the bases, although a substantially expanded U.S. military presence inevitably changes the regional security environment.
The agreement also strengthens NATO's northern geography. Norway, Iceland, Denmark/Greenland, Canada and the United States form a broad arc across the North Atlantic and Arctic approaches. Adding military capacity at Narsarsuaq and Mestersvig gives Washington additional locations from which forces, surveillance systems and supporting infrastructure could operate.
And what about China?
China is not an Arctic coastal state, but Beijing's ambitions in the region have become an important part of American strategic planning. Chinese companies have previously shown interest in Greenlandic infrastructure and mining, while Beijing has sought a larger role in Arctic shipping, scientific research and resource development.
The new treaty directly addresses that concern. It states that non-NATO countries cannot establish manned or unmanned military installations in Greenland or maintain a persistent military presence unless the parties agree otherwise.
Its economic provisions go further. Investors associated with countries outside NATO, NATO partner states or the European Union can be prevented from controlling, significantly influencing or gaining sensitive non-public information in sectors where such involvement is considered a national-security or public-order threat.
Although the text does not simply name China and ban Chinese investment, those provisions create a mechanism capable of limiting investment by countries Washington and its partners regard as strategic adversaries. This means the agreement concerns not only bases and missiles but also who can gain economic footholds in strategically sensitive Greenlandic sectors.
What does Greenland get from the agreement?
Greenland's government secured explicit recognition of Greenlanders as a people possessing the right to self-determination. Nielsen highlighted that point after signing, while Frederiksen said the agreement respected both the Kingdom's territorial integrity and Greenlandic self-determination.
There is also an economic component. The treaty says contracts connected with constructing, maintaining, servicing and eventually dismantling U.S. defence areas should be awarded to Greenlandic businesses to the maximum extent possible, taking account of whether local companies have the necessary capabilities.
That provision could matter considerably to a territory with only about 57,000 inhabitants. New bases require construction, logistics, transport, maintenance, food, accommodation and other services, potentially creating local business and employment opportunities alongside the political and environmental debates that a larger foreign military footprint will generate.
Does the agreement give Washington unlimited control?
No. It gives the United States very broad military access, but those rights exist inside an agreement signed by three governments and built on the 1951 defence treaty.
New defence areas beyond those already agreed require consultation. Unmanned installations outside defence areas require accelerated Danish-Greenlandic government approval. The agreement also repeatedly refers to mutual arrangements and consultations rather than simply transferring authority over Greenland to Washington.
That distinction matters because Trump's language about permanent American control is politically stronger than the legal structure contained in the published document. Washington obtains substantial and potentially long-lasting military privileges; Denmark and Greenland retain sovereignty and governmental roles in implementing them.
Why is this happening now?
The agreement is the product of two developments that collided during Trump's second presidency.
The first is strategic. Washington believes Russia's Arctic military strength, China's expanding regional interest, new missile technologies and changing Arctic accessibility require stronger defences around Greenland and the North Atlantic.
The second is political. Trump turned that security concern into a sovereignty dispute by repeatedly demanding American control of Greenland. Denmark and Greenland rejected acquisition, while the disagreement created an unusual confrontation among NATO partners. Negotiations eventually produced a formula allowing the United States to expand militarily without changing Greenland's political status.
That makes Tuesday's agreement more than a basing deal. It effectively converts Trump's demand for territorial control into a defence arrangement that Denmark and Greenland could accept.
What happens next?
The agreement does not mean two fully operational American bases will appear immediately. Denmark's government says it will enter into force only after the required national parliamentary procedures are completed. Detailed arrangements for Narsarsuaq and Mestersvig must also be negotiated, after which construction and deployment decisions can proceed.
The next indicators will be the size and mission of each base, the number of American personnel deployed, the scale of Pituffik's expansion and how much of Golden Dome Washington ultimately positions in Greenland. Those decisions will reveal whether the agreement produces primarily surveillance and missile-warning facilities or a much broader permanent American force structure.
The strategic direction, however, is already clear. Greenland is not becoming American territory, but it is becoming substantially more important to American defence. Washington will move from one active base toward a network spanning northwestern, southern and eastern Greenland, while Denmark and Greenland retain sovereignty and NATO becomes the political framework around the expansion.
For an Arctic region that spent much of the post-Cold War era on the margins of global security politics, that is a major shift. Greenland is increasingly becoming part of the front line connecting North American missile defence, NATO's North Atlantic security and the growing strategic competition involving Russia and China.