US, Denmark and Greenland strike an Arctic security pact that stops short of annexation

President Donald Trump said on 18 September that the United States, Denmark and Greenland had reached a security agreement that expands the American military footprint on the Arctic island and bars non-NATO powers from building bases there. He described the pact as an “infinite life” arrangement that gives Washington “permanent control over security, and all other needs, in Greenland” at no cost to the United States.

Danish Prime Minister Mette Frederiksen and Greenlandic Prime Minister Jens-Frederik Nielsen confirmed that a deal exists and said it would be signed on the sidelines of the United Nations General Assembly in New York next week. Their wording differed from Trump’s. Frederiksen said the agreement “recognizes the sovereignty and territorial integrity of the Kingdom and the Greenlandic people’s right to self-determination.” Nielsen called it a strengthening of security for Greenland, Denmark, the United States and the Western alliance.

The official text has not been released. What is public comes from Trump’s Truth Social post, statements in Copenhagen and Nuuk, and a State Department official who spoke on condition of anonymity.

What Washington says is in the text

According to that official, the pact grants the United States permanent access, basing and overflight rights, including the right to add military sites without a further approval step from Greenland or Denmark. Non-NATO states would be barred from bases or a standing military presence. A screening mechanism would apply to “sensitive investments,” a phrase aimed at Chinese and Russian capital in minerals, ports and communications.

Trump said no US adversary could “EVER have a base in Greenland, have a military presence in Greenland, or make sensitive investments in Greenland, without our express written approval.” He added that the United States would “immediately begin the process of developing a large Military presence in the appropriate part of Greenland” and work with Greenlanders on construction.

The United States already operates Pituffik Space Base, formerly Thule Air Base, 750 miles north of the Arctic Circle. The 1951 Defence Agreement with Denmark, updated over decades, already gives Washington wide rights on the island. The new language, if it matches the official briefing, adds an explicit ban on non-NATO bases and an investment screen that the older pact did not spell out in the same terms.

What Copenhagen and Nuuk insisted on

Trump spent much of his second term saying the United States should own Greenland. He framed the island as essential for missile warning, rare earths and denial of Arctic access to China and Russia. Danish and Greenlandic leaders rejected a transfer of sovereignty. The row strained NATO, because an attempt to take territory from a treaty ally by force would have broken the alliance’s basic premise.

The compromise that emerged after talks in Washington leaves the island inside the Kingdom of Denmark. It also preserves Greenland’s right to decide its political future, including independence, while the security clauses would, according to the State Department briefing, survive any change in that status. That last point is the part Nuuk will study most carefully once the text is published.

Greenland has about 57,000 people and a government that has spent years trying to convert mineral potential into revenue without handing control of ports or mines to a single outside power. Chinese firms have previously looked at rare-earth and infrastructure projects. Danish and American officials have treated those approaches as a security question. The new screen would put a formal US veto, or at least a US approval step, on deals that Washington labels sensitive.

Why the timing matters

The announcement landed four days before High-Level Week at the UN and weeks before the US midterm elections. The war with Iran has become a political weight for Republicans. A signed Arctic pact lets Trump claim he closed a file that had alarmed European capitals without a land transfer.

For Denmark, the value is the opposite of Trump’s slogan. Frederiksen can tell voters that sovereignty was not sold. For Nielsen, the test is whether the investment screen becomes a practical block on Chinese capital or a wider US say over Greenlandic economic policy.

NATO already treats Greenland as part of the North American defence area. The new deal does not create that fact. It writes it in language Trump can campaign on and that Copenhagen can live with, provided the published articles match the oral briefings. Until the three governments release the document, the gap between “permanent control over security” and “recognised sovereignty” remains a political translation problem, not a settled legal one.

The signature in New York will not end the argument about how much of Greenland’s future is now subject to a US written approval. It will only make that argument concrete.