The Muslim world is heavily divided, and even united would not have any effective power to counter that.
Of course, we can complain, but the Chinese aren't likely to give a toss.
I'd rather expect their leaders to be secretly having works on a disease that is going to kill billions. They'll get rid of Africa, Middle East, India the US. Even Europe might be on their list. To eliminate all potential threats and, by the way, get rid of pollution and excessive CO2 emission, by killing most of emitters.
With their system of state-enforced discipline, they could just vaccine all of their people, then release some GMO virus, and exterminate everyone else without firing a single gunshot.