Two places on a Greenland map now have a new military role on paper: Narsarsuaq and Mestersvig. On September 22, the United States, Denmark and Greenland signed an agreement allowing Washington to establish defense areas there and expand activity at its existing Pituffik Space Base. But no new base has opened, and the agreement still needs the required parliamentary procedures before it takes effect. Read the signed agreement.
By E.K.K · September 23, 2026 · News & analysis · 繁體中文
What has actually changed?
The document amends arrangements that have governed the U.S. military presence in Greenland since 1951. It authorizes modernization and expanded activity at Pituffik, and identifies Narsarsuaq in the south and Mestersvig in the east as additional defense areas. Their technical details and how they will be used must still be agreed by the parties. Further sites require a proposal and consultations rather than appearing automatically. Agreement, Article IV.
The agreement also gives U.S. military aircraft, vessels and forces broad rights to travel between defense areas through Greenland, subject to the terms in the text. It provides for accelerated review of requests for unmanned military installations—facilities that can operate without staff permanently on site. These are access and approval rules, not proof that any particular weapons have been installed. Agreement, Articles V–VI.
Why does Washington want a larger foothold?
Greenland lies between North America and Europe. Its location matters to early warning, aircraft movement and defense across the North Atlantic. The agreement mentions the possible establishment of a “Golden Dome” defense system, a proposed network meant to detect and intercept incoming missiles. It does not specify that such a system is already built in Greenland, nor does it publish a construction schedule. Agreement, preamble.
The parties also say non-NATO states may not establish military installations or a lasting troop presence on the island without their agreement. Rules on particularly sensitive investments target control or significant influence in sectors such as critical infrastructure and resource extraction. These provisions explain why China and Russia feature in the strategic discussion, even though the treaty does not turn every Chinese investment into a proven security threat. Agreement, Articles IX–X.
Greenland’s status remains central
The agreement explicitly reaffirms the Kingdom of Denmark’s sovereignty and the Greenlandic people’s right to self-determination. That matters after President Donald Trump’s earlier push to acquire the island strained relations with both Denmark and Greenland. Greenland’s prime minister welcomed recognition of its right to decide its own future, while Denmark’s prime minister described the agreement as rooted in NATO. Danish prime minister’s office, September 22; Reuters, September 22.
There is a legal and political gap between signing and implementation. The treaty says it enters into force only after Denmark and Greenland complete the necessary parliamentary procedures and notify the United States. The governments must then settle details for the new areas. Local residents still have reason to ask how construction, flights, the environment and contracts will be handled; the text says U.S. defense contracts should go to Greenlandic businesses where feasible and that military movement should respect local ways of life. Agreement, Articles IV, VI and XII.
The immediate development is a signed change to the rules, not two completed bases. The next reporting questions are when both legislatures act, what each new site will contain and how Greenlanders will be consulted as plans move from the document to the ground.
Sources
Full agreement, September 22 · Danish prime minister’s office, September 22 · Reuters reporting, September 22.