Bear in mind that there is quite a lot of sensitive airspace in China, and their radars are good enough to see small deviations if you elect to "scoot over to the side" around weather on the center of an airway or air route.
Also, deviations left or right may involve altitude changes. You may have to give up an altitude above the weather and descend ridiculously low to deviate around areas "due to restriction."
One more thing. When you go from one ATC region to another, the next controller may not know or care what weather avoidance you're doing so the dodgeball game might have to be started again from scratch. I've often gotten higher altitudes above weather, then been cleared down into it (expedite! 2500 FPM!) simply because the flight plan was filed for the lower altitude.
My point is to use caution because ATC can giveth and taketh away with Chinese characteristics.