Last time something like that was done, the US tried to hide 600 nuclear missiles under the ice.
DK needs a no-nukes guarantee, or Greenland would make itself the biggest and earliest target in a first strike attack - its bases would be closest to Russia!
History timeline in the attached post:
If you walk the same ice back in history, the mineral fight and the nuclear risk are not new weather.
On 9 April 1941 Henrik Kauffmann, Danish minister in Washington, signed the Agreement Relating to the Defense of Greenland with Cordell Hull. Article I recognised Danish sovereignty and gave the United States the right to build landing fields and "all other necessary measures."
German occupied Copenhagen recalled him; Washington kept him; after the war he was pardoned.
The 27 April 1951 Defense of Greenland Agreement, signed in Copenhagen, put Thule Air Base on a standing footing. Inuit families were moved off that ground.
From 1959 the US Army built Camp Century under the ice as a public "research" city. The hidden plan, Project Iceworm, was a lattice of some 600 medium-range nuclear missiles in tunnels that Copenhagen was not fully told about.
The ice moved. The scheme was abandoned in 1967. Waste and a small reactor were left in the sheet.
On 21 January 1968 a B-52 from the nuclear airborne alert crashed on the ice near Thule with four hydrogen bombs. Plutonium went into snow and sea. The cleanup was called Project Crested Ice.
Denmark had a no-nuclear policy on its territory. The bombs had been there anyway.
In August 2019 Trump asked to buy the island. Frederiksen said it was not for sale.
In 2021 Nuuk tightened the uranium rule that still blocks Kvanefjeld as designed.
In July 2026 Greenland Energy landed gear at Jameson Land without a green light; Hammeken-Holm answered with a warning, not a welcome.
On 1 September the Commission put money on Greenlandic minerals.
On 16 September it offered Canada an associate track built on the same minerals.
On 18 September Washington announced a veto on who may invest.
That is the sequence.
A nuclear missile silo is not in the leaked lines. Iceworm and the Thule crash are what "necessary measures" looked like the last time the same powers wrote on this ice.