By treaty, both sides were limited in missile defense. The Soviets placed theirs around Moscow (to hell with the krest'yanin), while the US placed them around larger cities (also likely targets but this diffused the effectiveness of the system).

Civil Defense was taken seriously in the US for a while (I was trained as a radiological monitor in high school) but fatalism and optimism took over. Countries like Switzerland made changes to their national building code requiring all homes and larger buildings to have shelters. IMO the US should have standardized shelter plans as an optional part of our building code, so if someone wants one, there's a proven design available.

With regard to Denmark, look to the Mormon Church. They have a mandate (not always followed!) to keep a years supply of food in the house. So the church has distribution warehouses and publishes information about long-term storage.

https://www.churchofjesuschrist.org/topics/food-storage/long...

Thanks for your informative comment. For real.