no
They didn't.
Only on test sites.
nuclear missiles. Captain Price
Submarines armed with nuclear ballistic missiles
Submarines armed with nuclear ballistic missiles
Submarines armed with nuclear ballistic missiles
No - the distance is too far and objects that far out could easily be detected. Nuclear deterrence during the Cold War was based on a constant shell game, and short flight times for missiles.
No. No nuclear weapons have ever been used in an act of war besides the two dropped on Japan during the Second World War. The United States and Russia both produced enormous amounts of nuclear weapons during the Cold War, though none were used.
The closest we came to a nuclear confrontation with Russia that I know of, was under John F. Kennedy during the Cuban Blockade in 1962.
At the highest number, it was less than 1500, with 1000 of these Minuteman missiles.
Cuba.
The installation of Soviet Nuclear Missiles in Cuba.