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Nothing but a few villages and small towns exists in Denmark.
To plaster Denmark with more than 20 nukes, you really have to go.....counter-area and nuke it because it is there (given the idiocy of nuclear war, one cannot rule this possibility out). I cannot think of many actual targets there unless you have a nuclear naval battle waged there.
that's some sad stuff to consider.
thousands of nukes, diverting 20 is like a "sprinkle" of oregano when making a metaphorical pizza out of Europe.