US, Denmark and Greenland Sign Historic Pact to Expand Military Presence and Counter China and Russia

Signed on September 22 on the sidelines of the UN General Assembly in New York, the agreement creates new US defence zones at Narsarsuaq in southern Greenland and Mestersvig on the east coast while expanding the existing Pituffik Space Base in the north. American forces will receive broad rights to move through Greenlandic airspace and territorial waters, including access for ships, aircraft and subsurface operations.

The more consequential provisions are less visible. Washington will be able to build additional defence infrastructure when it considers this necessary, subject to consultation rather than separate approval from Copenhagen or Nuuk. The agreement also restricts non-NATO and non-EU states from controlling or exercising substantial influence over strategically sensitive infrastructure, including ports, telecommunications, subsea cables and critical minerals.

The result is an unusual bargain: Denmark retains sovereignty, Greenland retains an explicit right to self-determination, yet the United States acquires a long-term security position designed to endure even if Greenland eventually becomes an independent state.

From Thule to a three-point military network

The new arrangement is structurally different from the US-Danish defence framework agreed in 1951.

That earlier treaty provided the legal basis for the construction of Thule Air Base, now Pituffik Space Base, but it was a bilateral arrangement between Washington and Copenhagen. Greenland was not a distinct party. The 2026 agreement brings Greenland directly into the framework and extends the American military footprint well beyond a single northern installation.

Pituffik remains strategically important because of its role in missile warning and space surveillance. Narsarsuaq adds a southern position close to major North Atlantic air and shipping routes. Mestersvig provides a new eastern foothold with relevance to the Arctic Ocean, the Greenland-Iceland-UK gap, and routes associated with Russia's northern maritime activity.

The geography matters because the agreement is not simply about adding bases. It creates a network spanning Greenland's northern, southern and eastern approaches.

That changes the character of American access. The United States is no longer relying on one major installation at the top of the island; it is establishing a broader architecture for movement, surveillance and defence infrastructure across Greenland.

The inclusion of potential deployment of the "Golden Dome" ballistic missile defence system adds another dimension. Greenland becomes part of a framework that links Arctic territory to wider American missile defence planning rather than treating the island as an isolated North Atlantic outpost.

Sovereignty without strategic autonomy

The most unusual feature of the agreement is its treatment of sovereignty.

The text explicitly reaffirms Danish sovereignty and Greenland's right to self-determination. Yet it also stipulates that the agreement remains binding if Greenland becomes independent.

That separates political sovereignty from military access in a way that is unusual for an emerging state.

An independent Greenland could therefore inherit formal control over its territory while remaining bound to a defence architecture negotiated before independence. The arrangement gives Nuuk recognition of its political future without giving a future Greenland complete freedom to redesign its external security relationships.

This is the central trade-off embedded in the agreement.

For Denmark, the arrangement resolves a difficult strategic problem created by months of tension with Washington over Trump's threats to acquire or annex Greenland. Copenhagen retains territorial sovereignty while securing an expanded American commitment to the defence of the High North.

For Greenland, the calculation is more complicated. The agreement formally recognises self-determination and gives Nuuk a place in a treaty that previously would have been negotiated primarily between Denmark and the United States. But it also embeds American military interests deeply into Greenland's future security policy.

The agreement therefore does not settle the question of Greenland's eventual political status. It changes what that status would mean strategically.

The Arctic's economic gates are closing

Military access is only one part of the new framework.

The agreement establishes restrictions designed to prevent countries outside the NATO and EU partnership structure from acquiring control, access, or substantial influence over strategically sensitive parts of Greenland's economy. The provisions cover ports, telecommunications, subsea cables and critical minerals, while specifically targeting strategic investment and military infrastructure associated with China and Russia.

That matters because Greenland's security value is not limited to its geography.

The island possesses significant undeveloped deposits of rare earth elements and has previously attracted Chinese interest in airport and mining projects. The new restrictions effectively place the most strategically sensitive parts of that economic landscape inside a Western security perimeter.

For China, this narrows the route into Greenland through commercial investment rather than military competition. For Russia, the implications are primarily strategic: the expansion of American access strengthens the northern flank of the NATO security architecture and increases the scope for monitoring the North Atlantic and Arctic approaches.

The economic provisions therefore work alongside the military ones. Infrastructure and mineral access are treated not as separate commercial questions but as components of national security.

That is a significant change in how Greenland's development is being framed.

A different bargain for Nuuk

Greenland is not being offered security commitments without an economic component.

Washington is required to prioritise Greenlandic contractors for construction, maintenance and eventual decommissioning of defence facilities. For an economy historically reliant on fishing and an annual Danish block grant, the expansion of US infrastructure could create opportunities for local businesses and skilled employment.

But the provision also creates a practical question: whether Greenlandic companies can meet the requirements and standards associated with American defence projects.

The treaty provides the preference. It does not, on its own, establish the capacity to deliver every project locally.

That gap could become important as the American presence expands. A larger defence footprint can generate economic activity while simultaneously increasing dependence on the external power responsible for much of the investment.

Greenland's strategic importance may therefore become an economic opportunity and a new source of political leverage at the same time.

Hard power replaces the old Arctic equilibrium

For decades, the Arctic could be approached as a region where security competition coexisted with cooperation, resource development and relatively limited military confrontation. The 2026 agreement points towards a different model.

The High North is increasingly being treated as part of the central perimeter of global military competition. Greenland's airspace, maritime approaches, communications infrastructure, critical minerals and military facilities are being organised around the possibility of strategic confrontation.

The timing is important. The agreement establishes this architecture before the opening of northern sea routes and wider access to Arctic resources has fully transformed the region's economic geography.

Washington is therefore not simply responding to a newly contested Arctic. It is establishing the rules under which access to the territory will be managed as its strategic value increases.

That gives the agreement a significance beyond the immediate dispute between Washington, Copenhagen and Nuuk.

The legal architecture is as important as the bases themselves. The United States receives broad freedom of access and a mechanism for expanding infrastructure through consultation rather than separate approval. Rival powers face explicit barriers to strategic investment. Greenland's future independence is recognised, but the defence relationship is designed to survive it.

The model amounts to an unbundling of sovereignty: territorial ownership and political self-determination remain formally intact while operational control over key elements of defence infrastructure, access and strategic connectivity becomes increasingly American.