Uh, it wasn't Cuba that backed down, but Russia and Khrushchev.
You seem to be the one with low information.
Cuba was the place where missles were located, not USSR.
Cuba could have easily told US to KMA. There were no USSR navy ships near Cuba.
What does it matter who backed down? The whole point was US was not going tolerate enemy weapons near it’s borders. Your hero Zelensky was pushing for NATO membership for years before Russia invaded. Russia is not going to tolerate NATO weapons on it border. And the homo-erotic dancer Zelensky still has not backed down.
So who has suffered? The Ukrainians. The country is now a living hell.