alt Hacker NewsBy "nuclear weapon" most people think of a bomb, but it can also mean the non-bomb portions of nuclear delivery systems such as rocket/missile bodies and aircraft. In times of rising conflict they could "forward-deploy" the warheads from Russia to be mated to rockets and such already in the field. So the peacetime "no nukes in Poland" policy can be true even though "nuclear weapons" were already waiting in bunkers there.
The west did basically the same thing. Not every "nuclear weapon bunker" at every American base actually held warheads.
In the Czechoslovak case those bunkers were definitely for the warheads - far too small for a whole Scud missile, air conditioned, etc. The delivery mechanisms were notionally conventional & are documented as stationed elsewhere.
It was in those bunkers where the warheads would be (were ?) stored in the time of crisis as a forward deployment.