Could Cuban bases support Soviet convoy attacks?

How important would Soviet bases in Cuba be to submarines attacking Atlantic convoys?

Potentially important, but the United States would probably destroy or neutralize them very early in the war.

The bases could extend Soviet access to the western Atlantic if submarines reached them and received support. Their proximity to the United States, however, makes them exceptionally exposed once war begins. American aircraft could attack known facilities before they became a durable sanctuary. The comparison with Berlin captures the choice: Cuba might be neutralized rapidly or bypassed, but NATO would not willingly allow it to remain a secure forward base.