Maybe it comes down to military might. Perhaps countries like China and Russia are the only ones who've ever had sufficient military capability that a Black Op can't just be sent in to assassinate any "problems"?
Maybe when smaller fry do it they get short shrift?
You can listen to the latest Joe Rogan episode talking about Biden putting pressure on any country that was going to provide Snowden/Assange* with safe passage/asylum.
* I wasn't listening intently enough to hear what was being said at this point.