Pretty sure genociding a ethnic minority breaks a lot of rules...
Also, not allowing international media into Xinjiang....obviously to cover up all the crimes, is one of the many things China does which goes hand in hand with not following "rules".
Keep in mind, every country breaks rules. Both the US and China do......China isn't some form of Angel. No matter what people might believe in.
If China gets its way, then China will be like, if not worse, than the US. They're playing it nice since they're the underdog...