The problem with ballistic missiles in Cuba is that they could strike the U.S. without giving sufficient warning for a nuclear counter-attack, thus breaking the MAD balance of the cold war. Cuba can and did make alliances with the USSR. That wasn't the problem. The problem was the much greater threat of nuclear Armageddon.
Ukraine wasn't going to ever have NATO nuclear missiles. They gave up the Russian ones. However, in 20 years, I wouldn't be surprised if a "neutral" Ukraine develops their own in secret.
Ukraine wasn't going to ever have NATO nuclear missiles. They gave up the Russian ones. However, in 20 years, I wouldn't be surprised if a "neutral" Ukraine develops their own in secret.