Washington, Copenhagen and Nuuk agree on expanded U.S. basing, overflights and a veto on adversary investment. Trump calls it permanent control of security at no cost.
After months of public pressure and private talks, the United States, Denmark and Greenland (a semiautonomous Danish territory) reached a security arrangement announced Friday. Trump said the United States will “FOREVER have the complete ability to do what is necessary” to defend Greenland and North America, will expand a large military presence, and will bar U.S. adversaries from bases or sensitive investments without written U.S. approval. He emphasized there is no cost to American taxpayers and no transfer of sovereignty.
BREAKING NEWS: I am pleased to announce that the United States of America has entered into an Agreement with The Kingdom of Denmark, and Greenland, that gives the United States permanent control over security, and all other needs, in Greenland, completely addressing ALL of our…
— Donald J. Trump (@realDonaldTrump) September 19, 2026
Signing is expected on the sidelines of UN week in New York, then parliamentary processes in Denmark and Greenland.
What the United States actually gets
A State Department official described permanent access, basing and overflight rights that survive even if Greenland later chooses independence. Non-NATO countries cannot plant bases. Investment screening is meant to keep Chinese and Russian money out of dual-use infrastructure and minerals. The United States already operates Pituffik Space Base under a Cold War-era arrangement; this pact widens the footprint and locks in rights that previously lived in older texts. The 1951 US-Denmark agreement allowed US defense areas (like Pituffik) by mutual NATO-based agreement, with later consultation rules. The new deal expands it: permanent rights with no expiry (surviving independence), US can add installations after consultation only, and bars adversaries from bases or sensitive investments without US approval. Signing expected next week.
NATO publicly welcomed the deal as a stabilizer in the Arctic.
What Denmark and Greenland get
Danish and Greenlandic leaders stressed that the Kingdom of Denmark keeps sovereignty and territorial integrity. No annexation. Greenlanders retain the right to decide their political future. That was the red line that made a purchase or coerced takeover impossible without blowing up the alliance. The deal is the off-ramp from a crisis Trump himself created by talking openly about taking the island. Critics will call the rhetoric reckless. Supporters will say the rhetoric produced a written, durable security lock that polite diplomacy had not.
Why it matters for the wars we already have
The Arctic is no longer a backwater. Russia’s Northern Fleet, Chinese dual-use research, and missile-warning geography all run through Greenland. Closing the island to adversary basing is cheaper than fighting for it later. It also keeps a NATO member whole instead of turning an ally into a territorial dispute. For an administration that says it wants wars ended, not multiplied, this is the preferred model: hard security, written vetoes, no new occupation.
The Danish and their relationship with Greenland is not all sunshine
Denmark's Prime Minister, Mette Frederiksen repeats it like a mantra. Greenland is part of the Kingdom, sovereignty remains intact. Formally, that's true. But she's leaving out the rest.
— Krisztina Maria (@KrisztinaMaria) September 19, 2026
According to the White House, the US now has veto power over strategic investments in… pic.twitter.com/dVF6TyomCD
