Seven UN special rapporteurs say, *Hong Kong security law 'may break international laws'.* It conflicts with treaties that China has signed.

This can have an effect on China but only if other countries condition some decisions on this.

I would expect that the lawless behavior of uniformed US thugs violates some treaties. And what about Guantanamo. and wars of aggression? Not that one country's wrongs excuse another country's wrongs — but would be easier to enforce the treaties if breaking them were unusual and unaccepted.