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Denmark says NATO shares responsibility for Arctic security under Greenland deal - Headlines news and analysis from Global Banking & Finance Review
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Denmark says NATO shares responsibility for Arctic security under Greenland deal

Published by Global Banking & Finance Review

Posted on September 21, 2026

5 min read

· Last updated: September 21, 2026

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Greenland Deal Places Arctic Security Under NATO’s Oversight

Landmark Security Agreement and Its Implications for the Arctic

By Stine Jacobsen and Jacob Gronholt-Pedersen

Background and Signing of the Agreement

COPENHAGEN, Sept 21 (Reuters) - Denmark, Greenland and the US are to sign a deal on Greenland's security on Tuesday, an agreement Denmark says will put Arctic security under NATO's watch rather than leaving it solely to Washington and Copenhagen.

The agreement, to be signed at the UN General Assembly in New York at 10:30 a.m. ET (1430 GMT) on Tuesday, has not been made public. Denmark and Greenland say the deal will benefit the Arctic island and respect its sovereignty.

Expansion of US Military Presence

The deal is expected to allow the US, which already has one military base in Greenland, to expand its military presence to two additional sites.

One of those sites is Narsarsuaq, whose population has dwindled to a few dozen people since the US closed its Cold War-era Bluie West One military base there in the 1950s. The other is Mestersvig, a military outpost currently used by the Sirius Dog Sled Patrol, a special forces unit that enforces Danish sovereignty in the territory, said two people familiar with the matter.

Trilateral Signing Ceremony

Trump will meet in New York on Tuesday with Danish Prime Minister Mette Frederiksen and Greenland Prime Minister Jens-Frederik Nielsen for a trilateral signing ceremony, a White House official said. 

Diplomatic Context and NATO’s Role

US Pressure and NATO Involvement

The deal follows months of pressure from Trump, who has said the US should control Greenland and at times refused to rule out using military or economic force to acquire the semi-autonomous Danish territory. His threats peaked in January, triggering a diplomatic crisis within the North Atlantic Treaty Organization, the military defense alliance, and pushing Denmark and Greenland into negotiations aimed at defusing the pressure.

The agreement "will be in a form where responsibility for security in the Arctic is not only Danish or American," Danish Foreign Minister Lars Lokke Rasmussen told national broadcaster TV2 on Sunday. He said that to a large extent "it would be NATO that looks after the Arctic."

Boosting NATO's 'Cohesion'

BOOSTING NATO'S 'COHESION'

It remained unclear whether the deal amends an existing 1951 defence agreement that is the legal basis for the US presence in Greenland. 

"It appears that we are now using this crisis to try to strengthen NATO's cohesion through Greenland," said Ulrik Pram Gad, a researcher at the Danish Institute for International Studies (DIIS).

Historical Perspective: US Strategic Interest in Greenland

World War Two and Cold War Era

Washington's strategic interest in Greenland dates back to World War Two. In 1941, the US signed a deal with Danish envoy Henrik Kauffmann, who acted without authority from his country, then under German occupation.  

The US sought the deal to keep Greenland out of German hands and secure the North Atlantic supply route between North America and Europe. Under the agreement, the US built airfields, naval facilities, and weather stations across the island, reaching around 5,500 military personnel by 1943, according to DIIS.

Post-War Agreements and NATO Clause

In 1946, President Harry Truman sought to buy the island as a strategic asset for $100 million in gold, but Copenhagen declined to sell. Instead, a new agreement was signed in 1951 that gave the US military extensive rights in Greenland but was tied to the existence of NATO.

"I don't think Denmark and Greenland will sign if the same NATO clause isn't included," said Gad.

Contemporary Security and Political Reactions

Promoting 'Security, Stability and Cooperation'

PROMOTING 'SECURITY, STABILITY AND COOPERATION'

During the Cold War, the US maintained 17 military installations and more than 10,000 personnel in Greenland. Today only Pituffik Space Base remains, with some 150 US military personnel.

A NATO spokesperson said on Saturday that the alliance welcomed the new agreement, which would "help advance security, stability and cooperation in this vital region". 

Official Responses and Public Reassurance

Rasmussen, who travelled to New York overnight, declined to discuss the contents of the agreement.

"But we have said from the start that we are open to accommodating the United States' legitimate security interests," he told Danish news agency Ritzau on Monday.

Trump said in a post on Truth Social on Friday the agreement gave the US "permanent control over security, and all other needs, in Greenland," and that no US adversary could have a base or military presence there without Washington's written approval. 

Denmark has not responded to Trump's assertion, though Copenhagen earlier acknowledged it underinvested in Greenland's defence for decades and has pledged to expand its military presence on the island, including more NATO troops.

Greenland's government has sought to reassure the public about the deal.

Erik Jensen, an opposition lawmaker in Greenland, wrote on social media that he had read the draft agreement. "I feel reassured and am not worried," he said, adding that the island's foreign minister was handling the work well.

Reporting Credits

(Reporting by Stine Jacobsen and Jacob Gronholt-Pedersen in Copenhagen; additional reporting by Steve Holland in Washington and Marie Mannes in Stockholm; Editing by Gareth Jones and Rosalba O'Brien)

Key Takeaways

  • The deal, signed at the U.N. General Assembly in New York at 10:30 a.m. ET on Sept 21, 2026, will shift Arctic security into NATO’s purview, reflecting a collective defense posture beyond just Denmark and the U.S. (Reuters) (investing.com)
  • Under the agreement, the U.S. may open two additional bases in Greenland—at Narsarsuaq and Mestersvig—reviving the Cold War-era Bluie West One and providing support near the Sirius Dog Sled Patrol’s area (Reuters) (marketscreener.com)
  • Pituffik (formerly Thule Air Base) remains the sole existing U.S. installation, renamed in 2023 and vital to missile warning and space surveillance under a 1951 defense accord embedded in NATO structures (Wikipedia; OrbitalIntel) (en.wikipedia.org)

References

Frequently Asked Questions

What is the new security deal involving Denmark, Greenland, and the US?
The deal aims to place Arctic security under NATO's supervision, expanding the US military presence in Greenland and involving NATO more directly in the region.
How will the agreement impact Greenland’s sovereignty?
The agreement is set to benefit Greenland and respect its sovereignty, ensuring that decisions about security involve all parties.
Which new military sites are being discussed in Greenland?
The agreement may allow the US to expand from its existing base to two additional sites: Narsarsuaq and Mestersvig.
Why does the US have strategic interest in Greenland?
Greenland is strategically important for controlling Arctic security and North Atlantic routes, a priority for the US since World War Two.
How does NATO fit into the new Greenland security arrangement?
NATO's involvement is being expanded, making Arctic security a collective alliance responsibility rather than just a bilateral issue.

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