Published September 19, 2026
United States (U.S.) President Donald Trump announced Friday that Washington has secured “permanent control” over Greenland's security under a new deal with Denmark and Greenland.
Greenland is the world’s largest continental island in the Arctic Ocean and it is a semi-autonomous region in the Kingdom of Denmark.
So has Denmark effectively handed over the world's largest island to Washington?
According to Denmark and Greenland, the deal with the U.S. doesn’t mean that Copenhagen has ceded sovereignty over its territory. Both governments insist Greenland remains part of the Danish Kingdom and that the agreement does not transfer sovereignty to the US.
What America is getting, however, appears to be considerable.
Under the agreement, the US will be able to build up a much larger military presence on Greenland.
Trump says the arrangement has no end date and gives Washington the ability to do whatever is necessary to defend both Greenland and the United States. He has called it an “Infinite Life” agreement.
The US will also have a say over who else gets access to the strategically important Arctic island.
According to the 80-year-old Republican president, an American adversary will not be allowed to establish a military base or presence there. Sensitive investments by those countries would also require written US approval.
That is a lot of authority, but it is not the same thing as owning Greenland.
Greenland is a self-governing territory within the Kingdom of Denmark. It controls most of its domestic affairs, while Copenhagen retains responsibility in areas including defence and parts of foreign policy.
Greenland's Prime Minister Jens-Frederik Nielsen said the arrangement isn't surrendering, adding that the new agreement recognises the sovereignty and territorial integrity of the Danish Kingdom as well as Greenlanders' right to decide their own future.
Danish Foreign Minister Lars Lokke Rasmussen said any final agreement must respect the kingdom's “red lines,” after months in which the 47th POTUS repeatedly talked about taking control of Greenland.
The full agreement hasn't been made public.
That means it isn't yet clear exactly how much freedom the US will have to expand its military presence or whether Denmark and Greenland have given Washington any formal authority over areas beyond security.
Trump's reference to “all other needs” has only added to those questions. The deal is expected to be formally signed around the UN General Assembly next week.