Bolton has many strong opinions that are not necessarily shared with the rest of the world -- not that he's wrong, but do use critical thinking. There are pros and cons here, like Trump causing short-term trade losses with China while they're dealing with political instability back home. Is economic stability worth more than relative world influence? Hard to say. Also, Xi telling Trump that he should have more terms is a classic way to play to a narcissist; it shouldn't be interpreted as anything more than flattery.
Honestly I think China has very little to gain from interfering on either side of the US election, and potentially a lot to lose. Russia, on the other hand...