Yes. Something like moving parts of the Nordic Air Force closer to Greenland (maybe Iceland, or even Greenland itself?): https://www.youtube.com/watch?v=fpGhd90y-BE
That would deter even the United States, I believe. The problem I see if it's worth it. As I said, as a Swede I don't really care about Greenland, but Denmark is part of the Nordic Family.
Interesting. This is the first I've heard of this combined airforce.
(Aside: it might deter the rational elements in the US military but they're led by this chap Trump.)