The United States, the Kingdom of Denmark, and the Government of Greenland have signed an agreement updating the 1951 Defence Agreement, strengthening long-term defence cooperation and NATO engagement in the Arctic.

The agreement reaffirms Denmark’s sovereignty and Greenland’s right to self-determination under international law while recognising the region’s growing strategic importance. It also states that any future military cooperation should provide tangible benefits for Greenlandic society and respect its environment and traditional way of life.

Key developments:

  • The United States may modernise and expand Pituffik Space Base and establish new defence areas at Narsarsuaq and Mestersvig, subject to agreed arrangements.
  • The parties support stronger NATO planning, exercises, intelligence cooperation and military presence in the Arctic.
  • The agreement prioritises Greenlandic businesses for defence-related contracts where practical and introduces measures to protect critical infrastructure and sensitive sectors from certain foreign investment.

The agreement was signed in New York on Tuesday (22 Sep) and will enter into force once the required parliamentary procedures are completed.

ℹ️ AP News, The White House 

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US President Donald Trump shakes hands with Greenland Prime Minister Jens-Frederik Nielsen as Danish Prime Minister Mette Frederiksen reacts, as they attend a trilateral signing event regarding a deal on Greenland’s security, during the 81st United Nations General Assembly (UNGA), in New York City, US, September 22, 2026. REUTERS/Kylie Cooper
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US, Denmark and Greenland strengthen Arctic security with updated defence agreement