Absolutely absurdity that has to stop. Greenland is far away from Russia. Fine, some possible ICBM missile trajectories go over Greenland, but NATO is not going to stop US from putting missile shield or offensive nukes in Greenland, as long as it stays under NATO oversight. The Putin Derangement Syndrome that extends to explaining all Trump actions as gifts to Russia needs to stop being said out loud. Pure CIA disinformation to somehow brainwash Europe into accepting this.
There are international waters between Iceland and UK. When US is part of NATO, with as a matter of fact, dictatorial control over NATO, ownership of Greenland doesn’t matter. It is only a severance of US/NATO alliance that makes Greenland matter.