The United States and Denmark have agreed a far-reaching security arrangement over Greenland, bringing an end to a months-long diplomatic crisis sparked by Donald Trump’s threats to acquire or seize the autonomous Danish territory.
The pact would establish enduring American military rights across Greenland, although the absence of its published text leaves important questions about its scope unanswered. Washington says the agreement protects the island from hostile powers, while Copenhagen insists it preserves Danish sovereignty and Greenlandic self-determination.
The agreement was announced on 18 September 2026, following sustained pressure from Trump, who has argued that Greenland’s location, minerals and military potential make it vital to American security.
A settlement announced at the United Nations
Trump announced the agreement through Truth Social, claiming that Washington would gain “permanent control over security, and all other needs”. He said it would impose “no cost to the United States” and allow America “to do what is necessary” to “secure and defend the security of Greenland”.
According to the US president, the arrangement would prevent any American adversary from maintaining a military presence on the island or “make sensitive investments in Greenland, without our express written approval”.
Prime Minister Mette Frederiksen confirmed that the agreement is scheduled to be signed at next week’s United Nations General Assembly. She described it as a measure that “strengthens security in the Arctic and the North Atlantic area”.
Frederiksen also emphasised that it “at the same time recognizes the sovereignty and territorial integrity of the Kingdom and the right of the Greenlandic people to self-determination”.
Formal ratification is still required. The Danish prime minister said the agreement “will have to go through the necessary parliamentary procedures to enter into force”.
Jens-Frederik Nielsen, chairman of Greenland’s Government, welcomed the proposed arrangement. He said it “is gratifying that we are about to enter into an agreement that ensures and strengthens the security” of Greenland, Denmark and the United States.
“The agreement recognises Greenland’s interests and our place in international co-operation. It is for the benefit of us all,” Nielsen added.
US Secretary of State Marco Rubio likewise called it a “historic deal” and a “huge win for the United States and the American people”. He said: “This deal permanently and completely addresses our national security concerns in Greenland.”
Permanent access and restrictions on rivals
No text of the agreement has been released. The BBC has contacted the Danish Embassy and the White House for further detail, but an unnamed US State Department official provided a broad outline.
The official said the arrangement would remain in force even if Greenland eventually became independent. It would also give the United States unilateral authority to construct additional military facilities without approval from either Greenland or Denmark.
Under the agreement, the US would enjoy “permanent access, basing and overflights rights”, the official said. That language suggests a permanent military architecture extending well beyond the country’s existing presence on the island.
It would also bar non-Nato countries from establishing bases in Greenland. In addition, it would prevent countries regarded as American adversaries from making investments in sectors considered sensitive to US security.
The unnamed official specifically identified Russia and China. Under the present arrangement, the official said, adversaries have been able to invest in Greenland’s “sensitive sectors without investment screening”.
Those restrictions would stop both countries from deploying troops or investing in areas judged capable of threatening the United States. Washington’s express written consent would be required for such activity.
Without access to the agreement, however, it remains unclear precisely how these provisions differ from the existing US-Denmark arrangement. A pact signed in 1951 already permits the United States to station as many troops in Greenland as it considers necessary.
The strategic value of Greenland
Greenland’s importance has grown as the Arctic becomes increasingly central to military planning, shipping and competition over natural resources. Its position between North America, Europe and the North Atlantic gives it particular value for surveillance, aviation and naval operations.
The United States already has more than 100 personnel permanently stationed at Pituffik Space Base, near the territory’s north-western tip. The installation supports American operations across the Arctic and has become a cornerstone of NATO’s northern defence network.
Trump has presented Greenland as essential to his proposed Golden Dome system, a missile-defence network intended to protect the United States from attacks launched by Russia and China. He has suggested that European allies could participate in the project.
Denmark and several other NATO governments were alarmed when Trump entertained purchasing Greenland and subsequently threatened military action. His remarks were widely condemned as incompatible with the principles underpinning the alliance and with the territorial sovereignty of its members.
The resulting diplomatic crisis placed an unusual strain on relations between Washington and Copenhagen. It also raised broader questions about whether the United States’ changing approach to the Arctic could affect European security planning.
Minerals, sovereignty and self-determination
Greenland’s vast and largely untapped reserves of rare earth minerals add another layer to the dispute. The materials are essential to technologies including mobile phones, electric vehicles and advanced defence systems.
Trump has argued that the territory’s strategic location and mineral wealth leave it vulnerable to influence from Russia and China. Critics have said those arguments provide a cover for ambitions to annex the island, which Denmark has always considered an inseparable part of the Kingdom.
The proposed agreement seeks to address some of those concerns while formally recognising Greenland’s political status. Frederiksen said it protects both sovereignty and the right of its people to determine their own future.
That distinction will be closely watched. Greenland has gradually expanded its self-government, and any long-term alteration to foreign military access could have consequences extending far beyond the immediate security arrangement.
For now, the agreement remains subject to parliamentary approval and formal signature. Its eventual effect will depend on the provisions contained in a document that neither Washington nor Copenhagen has made public.
Why it Matters
The proposed Greenland agreement could consolidate a permanent US military position in one of the world’s most strategically significant regions, while placing new limits on Russia and China. Its promises to respect Danish sovereignty and Greenlandic self-determination are therefore crucial: if the pact is seen as preserving political rights while expanding American defence access, it may stabilise a deeply fraught dispute; if it is viewed as stripping Greenland of meaningful control over its territory, it could reopen one of the most damaging transatlantic confrontations of the Trump presidency.
