Why are you laughing? It's entirely true. I'm a democrat btw.
He died before he could do anything, and the Cuban Missile Crisis was something of his making. His advisers, civilian and military said that missiles on Cuba did not change the strategic outlook at the time. The US had something like 10x as many ICBMs at the time. Many times more strategic bombers at the time. Basically at the time of the Cuban Missile Crisis the US was miles ahead in nuclear armaments and delivery systems.
His advisers told him that it wasn't really a big deal at all, and that they were roughly equivalent to the medium range nuclear missiles the US had stationed in Turkey and other nations on the doorstep of the USSR. The US had "Jupiter" class missiles in Turkey. The missiles in Cuba were taken as a political threat to him, and that is how he dealt with them. They were not deemed a military threat and he didn't really consider them as such in private. In public he stated they were essentially an imminent first strike threat.
An adviser of his recommended that through back channels the US could trade the Jupiter missiles in Turkey for the missiles in Cuba. Kennedy threw him under the bus, destroyed his career, and then went ahead and did exactly that. Kennedy also threatened Khrushchev that if the USSR made the deal public, Kennedy would back out of the deal and immediately reinstall the weapon systems on the Soviet border.
So, in short, Kennedy took the world to the brink of global annihilation, so he could look good. His civilian and military advisers did not consider the missiles on Cuba as representing an increase in the USSRs nuclear threat, nor a first strike weapon. He lied about what he was doing. He hid his deal with the USSR, and then he and his advisers invented a narrative that made the USSR look weak and made him look strong.
I guess laugh away. It must be fun not being educated