A liberal multicultural postmodern democracy continually acting as if immigration (both legal and illegal) and diversity are its strengths, particularly when that turns out to be factual (see: large American cities becoming influential cultural exporters and hotbeds of innovation, like New York and Silicon Valley etc) means American propaganda is only more effective when it's backed by economic might.
It also means the American propaganda is WILDLY contradictory. There's a million sources and it's a noisy burst of neon glamour. It is simply not as controlled by authority, however they may try.
You cannot liken authoritarian propaganda to postmodern multicultural propaganda. The whole reason it's postmodern is that it eschews direct control of the message, and it's a giant scrum of information. Turns out this is fertile ground, and this is also why attacks by alien propaganda have been so effective. If you can grab big chunks of the American propaganda and turn it to your enemy weapon of war and destruction of America quite directly, well then the American propaganda is not on the same destructive level as your rigidly state-controlled propaganda.
The USA absolutely has its overton window, and if you step outside it, bank accounts get shut, you're put on secret no fly lists, private companies who suspiciously act as official public broadcasting channels deplatform you, etc.
And let's not even talk about what Authoritarian western nations like the UK will do to you.
Russian propaganda, at least in English (which I confess is the only way I can consume) it, is also very contradictory. RT oscillates wildly between "global south throwing off the shackles of western imperialism" and "degenerate western nations destroy traditional family values", in effect trying to target both shitlibs and chuds.
Russia is also very multicultural and slavic ethnonationalism is not at all in the mainstream.