Russia already has a similar law since 2016, although it's applied selectively to whomever they please rather than to everyone by default. And the guise of the day is terrorism, not child abuse.
When you guys were surprised about Room 641A, Russia already had warrantless surveillance boxes mandatory for every ISP by law.
I've no clue about China, but I'd be very surprised if they're not even worse in this regard.
It would be "NoSignal" from this Act on.