US, Denmark, and Greenland sign a new defense agreement expanding Arctic missile security.

The United States, Denmark and Greenland signed an Arctic security agreement at the U.N. in New York, allowing expanded U.S. military access to Greenland for the Golden Dome missile-defense system. The deal reportedly provides for two additional U.S. bases and builds on an existing defense pact, while affirming Greenland’s sovereignty and right to self-determination; future military installations on the island would be limited to NATO members. Danish political parties broadly welcomed the agreement, which is intended to strengthen security in the Arctic and North Atlantic and ease tensions after President Trump’s repeated calls for the United States to own Greenland. The agreement still requires approval by Greenland’s parliament and Denmark’s Folketing.
The agreement does not set an expiry date and would require Greenland to remain committed to NATO if it becomes independent.
The existing 1950s defense deal already allowed U.S. military presence in Greenland upon notification to Denmark; the new agreement builds on that arrangement.
Trump put the Golden Dome’s initial implementation cost at $17.5 billion, while the Congressional Budget Office projected a total cost of $1.2 trillion over 10 years.
Experts cited in the coverage say Greenland’s position on the shortest missile trajectory from Russia’s Kola Peninsula or China toward the U.S. East Coast makes it valuable for locating early-warning sensors and weapons; one described the broader strategic aim as weakening adversaries’ deterrence.
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