The September 2026 announcement is a new trilateral agreement involving the United States, Denmark, and Greenland. It builds on the 1951 arrangement rather than replacing it outright. Key differences reported so far include:
• Greenland is now a formal party to the pact.
• Explicit U.S. veto or approval rights over adversary (non-NATO, especially Russian or Chinese) military bases, presence, or “sensitive investments.”
• Language emphasizing permanence that is intended to survive even if Greenland later chooses independence.
• Immediate plans for a larger U.S. military footprint, plus investment-screening mechanisms.