A year-long standoff over one of the world’s biggest islands may finally be coming to an end. The United States, Denmark, and Greenland are signing a major new Greenland Arctic deal today, September 22, 2026, at the United Nations in New York. Here is the full story, explained in simple words.
What Is Being Signed, and When
President Donald Trump, Danish Prime Minister Mette Frederiksen, and Greenland Prime Minister Jens-Frederik Nielsen are meeting at 10:30 a.m. ET on Tuesday to sign a three-way security agreement. The signing is happening at the United Nations General Assembly in New York. The deal will let the United States expand its military presence in Greenland.
Why Greenland Matters So Much
Greenland is a huge island that sits between the Arctic and North America. It used to be a colony of Denmark, and today it is a semi-autonomous territory, meaning it governs many of its own affairs but is still part of the Kingdom of Denmark. Greenland is important for two big reasons: its location gives it major strategic and military value, and it holds large amounts of valuable natural resources and minerals underground.
How the Standoff Started
This crisis began back in January 2026, when President Trump refused to rule out using military or economic force to take control of Greenland. This caused a serious diplomatic crisis, not just between the US and Denmark, but within NATO itself, since Denmark is a NATO ally. In response, thousands of people protested in Copenhagen, Aarhus, Aalborg, and Nuuk (Greenland’s capital) — in fact, close to 25% of Nuuk’s population took part in demonstrations, making it one of the largest protests in Greenland’s history. Denmark also responded by sending a large number of troops to Greenland as a show of support and defense.
What the New Deal Actually Does
According to Reuters, which spoke to people familiar with the matter, the agreement will allow the US to expand its military footprint in Greenland in a real, concrete way. Beyond the already-existing Pituffik Space Base, the deal is expected to open two new US military sites:
- Narsarsuaq — a former Cold War-era airbase, where only a few dozen people currently live
- Mestersvig — a site currently used by the Sirius Dog Sled Patrol, an elite Danish military unit that patrols the Arctic
This would mark the largest expansion of US military presence on Greenland since the Cold War.
A Middle Ground on Control
One of the most important details in this deal is how it handles overall control of Arctic security. Danish Foreign Minister Lars Lokke Rasmussen explained that the agreement places Arctic security under NATO’s collective watch, rather than leaving that responsibility only to the US and Denmark alone. This appears designed to reassure other NATO allies and Denmark itself, after months of tension about the US acting alone.
However, there is still some disagreement in how each side describes the deal. President Trump said on Friday that it gives the US “permanent control over security, and all other needs, in Greenland.” Denmark has not directly responded to that specific claim, but it has said the agreement respects the Kingdom of Denmark’s sovereignty and Greenland’s right to self-determination — meaning Greenland’s own right to decide its future.
A Retreat From Trump’s Earlier Threats
It’s worth being clear about how far this is from where things started. Trump had earlier threatened outright annexation, meaning taking full ownership and control of Greenland. This new deal is very different — it focuses on expanding US military bases while still officially respecting Danish sovereignty and Greenland’s self-determination. In that sense, this agreement represents a significant step back from Trump’s original, more aggressive position.
Who Else Got Involved
The Greenland crisis wasn’t just a US-Denmark issue. Several other countries got involved in supporting Denmark and Greenland during the standoff, including Belgium, Estonia, Finland, France, Germany, Iceland, the Netherlands, Norway, Slovenia, Sweden, and the United Kingdom, as well as Canada and the European Union. Canada and France had also separately announced plans to open new diplomatic presence connected to the situation earlier in the year.
Frequently Asked Questions
What is the Trump-Denmark-Greenland deal about?
It’s a trilateral security agreement, signed on September 22, 2026, that allows the US to expand its military presence in Greenland, including opening two new military sites, while officially respecting Danish sovereignty and Greenland’s self-determination.
Why did the US-Greenland standoff happen in the first place?
It started in January 2026, when President Trump refused to rule out using military or economic force to take control of Greenland, triggering a diplomatic crisis within NATO and large protests in Denmark and Greenland.
Does this mean the US now owns Greenland?
No. The deal expands US military presence but keeps Greenland as part of the Kingdom of Denmark, with the agreement stating it respects both Danish sovereignty and Greenland’s right to self-determination.
Which new military sites will the US use in Greenland?
The deal is expected to add two new sites, Narsarsuaq and Mestersvig, alongside the already-existing Pituffik Space Base.
After more than a year of tension, protests, and uncertainty, today’s signing marks a real turning point for Greenland’s future — even if some details, including exactly how “permanent” US control will be, still remain open to interpretation between Washington and Copenhagen.
