Russia has been pretty damn effective at this. (I took note of this when moderating r/europe on reddit when things started churning in ukraine)
China on the other hand not so much.
I might go trough the effort of finding them again but someone here shared some American studies that showed china initially didn't really have such a presence of bots and the like on twitter, fb, etc like Russia at that point (i think around 2016 or 2017) but there were notable networks of bots targeting chinese people with anti china stuff.
A second study showed that i think 3 years later China had also gotten into this but that it was comparatively small scale and notably incompetent.
China on the other hand not so much. I might go trough the effort of finding them again but someone here shared some American studies that showed china initially didn't really have such a presence of bots and the like on twitter, fb, etc like Russia at that point (i think around 2016 or 2017) but there were notable networks of bots targeting chinese people with anti china stuff.
A second study showed that i think 3 years later China had also gotten into this but that it was comparatively small scale and notably incompetent.