1. no, I never heard anyone suggest that democracy was around the corner in China.
2. No, the embargo didn't keep Cuba from sending military equipment or soldiers to other countries....just how do you think the embago would have done what you suggest?
3. The bay of pigs was an operation started by Eisenhower. Kennedy was too new at the job to stand up to the CIA and Pentagon.
The embargo on Cuba has done nothing worth the effort. Fidel outlasted Eisenhower, Kennedy, LBJ, Nixon, Ford, Reagan, Bush, Clinton and George W....It was time for it to end.