The combined population of China and Russia is less than a fifth of the world (15-16 bn vs 80+ bn). Edit: should be 1.5-1.6 bn vs 8 bn.

I'm only discussing Trump's behaviour and its effect on totalitarian governments, I don't have enough knowledge to discuss the rest of what you wrote.

I think the recent series of Trump's actions against Ukraine have failed to send a message to totalitarian governments that matches his own words. This has nothing to do with how much of the population Trump rules.