[Even at the height of the Cold War, with armies and navies facing off on a hair-trigger world-wide, with land and sea-based ICBMs ready to launch, the treaty guaranteeing free transit of anybody and anything (NATO military supplies, whatever), was not hindered.]
Note that during the confrontation over access to Berlin, the *Russians* cut off road and rail access. Did Kennedy nuke Russia? No - he mounted the Berlin airlift. The Russians don’t need to mount an airlift to resupply Konigsberg, although they could certainly do so - they have access from the sea.
I specifically mentioned treaties POST the 48-49 Berlin Airlift.
Were you too high on fentanyl hopium to notice?
If you are still conscious, and not too high, I was actually, physically, diving aboard several nuclear submarines from time to time in the 1980s.
Let me tell you, brother, those USN submarine crews were on a second-by-second wartime-footing nuclear hair-trigger. They were keeping track of the Soviet subs, and vice-versa, and life or death could come down to who reacted first and more effectively to the sound, say, of a distant torpedo tube outer door opening. It was hair-trigger wartime operations from submerging to surfacing (much later.)
If your 1980s nuclear submarine Cold War memories differ from mine, I’m all ears.