US President Donald Trump is touting a new security agreement between the United States, Denmark, and Greenland as a personal triumph. The deal, announced on September 20, 2026, grants Washington permanent control over Greenland's security and the power to prevent adversaries from establishing military bases or making sensitive investments. However, the Prime Minister's Office of Denmark describes a different bargain: stronger Arctic security that preserves the Kingdom of Denmark's sovereignty and territorial integrity, as well as Greenlanders' right to self-determination.
The agreement has been met with mixed reactions, with each party able to declare success. Trump gets the spectacle of power, while Denmark and Greenland keep nominal sovereignty. NATO avoids an immediate rupture, but the deal rewards months of coercion against an ally. The agreement normalizes a sphere-of-influence politics in which smaller states remain legally sovereign but face pressure to accept strategic subordination. This has raised concerns about the implications for democracy and the alliance.
The domestic backdrop in the United States makes the agreement more concerning. On the same day Trump announced the Greenland deal, reporters from CNN, MS NOW, and Politico were denied access and their credentials confiscated. International IDEA reported that nearly half of its 30 indicators for US democracy had fallen to their lowest levels since its dataset began in 1975. This is not a separate political theatre, as Trump's claims of power to decide which media are legitimate and which states and investments are legitimate within an ally's territory replace reciprocal rules with personal permission.
The timing of the Greenland "deal" is unusually favourable for Trump, coming shortly before the November midterm elections and while the war with Iran and his broader foreign policy record have become major political liabilities. A September Quinnipiac poll found only 29% of registered voters approved of Trump's handling of Iran, while 65% disapproved. His foreign policy approval stood at 33%. Congressional Republicans have also begun defecting on war-powers votes as the conflict drags on.
Denmark and Greenland also gain something important from the agreement, avoiding annexation, forced sale, and the immediate danger of a confrontation within NATO. Their joint public statement explicitly preserves sovereignty, territorial integrity, and Greenlandic self-determination. NATO receives a reprieve, and the agreement creates a common Arctic-security agenda. However, the gap between Trump's language and the apparent substance of the agreement is significant.
Under the 1951 defence agreement, later supplemented in 2004, the United States already possesses nearly total overflight and basing rights. The new agreement may still contain meaningful additions, such as restrictions on non-NATO military bases and US approval over certain sensitive investments. However, these gains fall well short of Trump's repeated demand to own or control Greenland. The diplomatic cost is high and will be felt long-term, with European governments increasingly questioning whether the United States is a reliable security partner.
The agreement has implications for NATO and the Monroe Doctrine, which opposes interference by any external power other than the US in the affairs of the Western Hemisphere. Greenland has been here before, with the US telling the British ambassador in 1940 that the Monroe Doctrine covered Greenland without qualification. The agreement delivers exactly that, with Washington acting as Greenland's security guarantor in its own right. Allies have taken notice, with at least eight members, including Denmark, moving to reduce their reliance on the US.
Key points
- The agreement rewards months of coercion against an ally and undermines trust in the alliance.
- The deal normalizes a sphere-of-influence politics in which smaller states face pressure to accept strategic subordination.
- The agreement has implications for NATO and the Monroe Doctrine, with Washington acting as Greenland's security guarantor in its own right.
