videogamer
Banned
Yes, the US government was unhappy about Castro's takeover,but they didn't go in occupy an area. Guantanamo was already under US control. As of now, most Americans probably don't care about Cuba.Putin's invasion of the Ukraine has been shameful but I wouldn't use the US treatment of Cuba as an example of a power accepting the public's will. We tried to overthrow Castro by arming a group of rebels, tried to kill him several times, and then spent decades trying to starve the country into submission.
As noted above, no successful invasion occurred.The US tried to invade Cuba, failed then blockaded and embargoed Cuba for decades, it's not like the US paid it no mind.
Korea and Vietnam were once vassal states. They are no longer.Korea and Vietnam were both in China's sphere of influence, China sent millions of troops to fight in the Korean War and is only starting to relax its backing of North Korea now. China heavily supported the North Vietnamese.
The French took over Vietnam without much Chinese resistance, and the Japanese took over Korea without any major Chinese opposition as far as I know.
China may support North Korea, but it's not like they are in active war with South Korea either. China may have supported the North Vietnamese. However, relatively soon after the Vietnam war, Vietnam and China fought the Sino-Vietnamese War.