Dictators do tend to command high vote counts. When people see you are going to stick around they try to keep you happy. As in russia, the province that most supports the leader recieves the most from him in turn.
Pretty sure Putin stays in power because people still remember Yeltsin. Today's Russia is a massive improvement on 90's Russia.
As for Xi, China isn't exactly doing poorly. Not sure why anyone would want to shake things up now.
Americans should understand, Obama would have beat Trump...
Or are you referring to his other opposition, which are paid by the US to commit crimes, and still barely get a slap on the wrist?
It is one of the few constant themes in Russia.