Trump Claims Permanent U.S. Control Over Greenland — No Signed Deal Shown

On September 18, 2026, Donald Trump claimed Washington had reached an agreement with Denmark and Greenland concerning Greenland. Al Jazeera reported the claim as posted by Trump, without independent confirmation of a signed text.

Trump claimed the agreement gives the United States "permanent control over security and all other needs" in Greenland. In a Truth Social post, he said the US will "FOREVER have the complete ability to do what is necessary in Greenland". The language was absolute. No documentation was published.

Trump further claimed US adversaries will be barred from setting up military bases or personnel in Greenland unless they receive written authorisation from the United States. He claimed plans will begin immediately to build a significant US military footprint in suitable areas across Greenland. Both statements were presented as elements of the claimed deal, not as separate orders with published directives.

As reported by Al Jazeera on September 18, neither Denmark nor Greenland had issued an official response to Trump's claim at the time of that report. No text, signing date, or ratification procedure was cited in Trump's account. Ratification is the formal process that makes an agreement official under domestic law.

The claim follows nearly two years of public pressure over the island's status. As president-elect in January 2025, Trump said he wanted to make Greenland a part of the United States, according to Reuters. In early 2026, he intensified calls for US control over Greenland, citing national security concerns related to Russia and China. On July 7, 2026, he said Greenland should be controlled by the United States, not Denmark.

Economic pressure accompanied the political message. Trump threatened to impose a 10% import tariff on goods from Denmark, Norway, Sweden, France, Germany and the UK. A tariff is a tax charged on goods entering a country. That threat was reported in January 2026 coverage of the dispute.

Copenhagen has previously pointed to existing military arrangements rather than transfer of sovereignty. Sovereignty is the legal authority to govern territory. Danish Prime Minister Mette Frederiksen stated that a defence agreement already exists between the Kingdom and the United States giving the United States wide access to Greenland. The Danish Prime Minister's Office published a page titled "Fællesudtalelse om Grønland" (Joint Statement on Greenland) on January 6, 2026.

The broader context here is the gap between access and control. Wide access for troops, flights, and bases is common among allies, like long-term permission to use shared facilities. Permanent control over security and other needs, plus a US veto over third-country basing through written authorisation, would be a different legal order. Without a published text, experts cannot assess whether Trump is describing a new binding agreement, a political declaration of intent, or a unilateral interpretation of existing defence authorities.

Looking at what this means in practice, three tests matter. First is authentication. A claim by one party does not establish mutual consent. Confirmation from Copenhagen and Nuuk, with title, signatories, and domestic legal basis, is required. Second is scope. Barring adversaries, defining suitable areas, and authorizing immediate construction all imply operational annexes, status provisions, and jurisdictional rules. None have been disclosed. Third is durability. "Forever" is political language. In treaty practice, duration, withdrawal, review, and dispute settlement determine permanence.

For now, the verifiable event is narrow. A sitting US president has publicly claimed a permanent settlement on Greenland security. The counterparties have not publicly validated that description in the reporting to date. Until they do, the footprint expansion should be read as announced intent, not executed deployment.