US Secures Military Foothold in Greenland While Denmark Keeps Sovereignty

A Deal That Ends Nearly Two Years of Arctic Tension

What began as an audacious — and alarming — demand by President Donald Trump to seize one of the world's largest islands ended on September 18 with something far more diplomatic: a trilateral security agreement between the United States, Denmark, and Greenland. Under the deal, the United States receives rights to an expanded military footprint in Greenland with greater security control, without transferring any sovereignty of Greenland to the United States. It is a significant outcome for all sides — and a remarkable resolution to a crisis that had rattled the NATO alliance for nearly two years.

Trump announced the deal after months of threatening to take the island by force from the NATO ally. In a social media post, he said the emerging agreement "gives the United States permanent control over security, and all other needs, in Greenland, completely addressing ALL of our many U.S. concerns." He added that his administration would "immediately" begin the process of developing a larger military presence on the mineral-rich Danish territory.

What the Agreement Actually Does

Under the framework outlined by a senior U.S. State Department official, the agreement grants the U.S. unilateral authority to build and expand military infrastructure across the island without requiring additional case-by-case approval from Copenhagen or Nuuk, and guarantees permanent basing, transit, and overflight rights across Greenland's airspace and territorial waters. Those are sweeping powers — but they stop well short of ownership.

China and Russia are locked out of Greenlandic bases and security-sensitive investments unless the US signs off, according to a State Department official. The agreement could potentially allow the US a veto over investments in Greenland from countries like Russia and China, given American concerns that such investment — especially in sensitive areas like minerals — could impact the US position there. For Denmark and Greenland, the sovereignty question was paramount. Denmark's Prime Minister Mette Frederiksen said the agreement "recognises the sovereignty and territorial integrity of the kingdom and the right of the Greenlandic people to self-determination."

The Mineral Stakes Underneath the Ice

Security is only part of the story. The real long-term prize may be what lies beneath Greenland's frozen surface. Greenland ranks eighth in the world for rare earth reserves, with 1.5 million tons, and is home to two rare earth deposits that are among the largest in the world: Kvanefjeld and Tanbreez. US Geological Survey data shows that China supplies more than 90% of US rare earth element demand, underscoring Greenland's strategic position in America's pursuit of supply chain diversification.

Greater security certainty, plus screening of Chinese or Russian strategic investment, could make Western capital more comfortable financing Greenland's mines, power systems, ports, water infrastructure, and processing. Still, experts caution against expecting an overnight transformation. Access to Greenland's rare earth minerals is constrained by both technology and limited downstream facilities, and it will take many years to explore, develop, and bring those resources to market.

What Comes Next

The office of Denmark's Prime Minister said the deal would be signed by three governments during the United Nations General Assembly in New York, but parliamentary action is still needed by the Danish and Greenland governments before it can be enforced. The signing took place on the sidelines of the UN General Assembly this week. NATO welcomed the agreement, with a spokesperson saying the alliance believes it will "help advance security, stability and cooperation in this vital region."

Trump's repeated demands for Greenland and threats to take it by force rattled the NATO alliance and discomfited European allies. "I think Americans really underestimate how damaging it was for the image of the United States in Europe," said Imran Bayoumi, an associate director at the Atlantic Council's Scowcroft Center for Strategy and Security. The deal, then, is not just about Arctic geography — it's a test of whether the US can rebuild trust with allies while still advancing its strategic interests. How Denmark and Greenland's parliaments respond in the coming weeks will determine whether this fragile agreement becomes lasting policy.