I mean, it’s China’s too - as well as Saudi Arabia, and others. But Russia seems to be the most effective at it. Hell, for that matter, US intelligence does it abroad too. All first-world nations probably participate in this kind of destabilization tactic to some degree.
Why do you think the Great Firewall of China exists? Same reason – we were filling their heads with anti-communist propaganda and that’s the only way China deemed was possible to keep us out.