At this point, I don't see any new UA flights to China other than maybe adding 3 weekly SFO-PVG to make it a daily flight.
Currently SFO=PVG runs 4 times a week.
Flights from the east coast such as EWR/ORD/IAD-PEK/PVG/HKG can't run unless UA reduces weight due to restriction of Russian air space.