1. Cuba was in our "backyard", thousands of miles from the USSR.
2. The USSR had a tiny navy whose ships were of dubious quality.
3. Russia's nuclear forces are far greater in quantity and capability than they were in 1962.
Other than how MM, and maybe some DUmmies feeeeeeeeeel, the Cuban Missile Crisis is not at all analogous to the situation in Ukraine. "Calling Putin's nuclear 'bluff'" would be moronically dangerous. I do worry, some, that Joe & Kammie and Krew are that kind of moronic.