Ok... But China does not want to solely source from Russia. That would not strengthen their position. They are major stakeholders in consumption obviously.... And they want to continue to buy from Iran (through re-flagging ect) and KSA.
You can see from this article (unless I missed something...) Via Ocean vessels:
Saudi Arabia is the single largest exporter to China, accounting for 15.6% of volumes in Jan-Sep 2023. In Jan-Sep 2023, China imported 59.8 mln tonnes of crude oil from Saudi Arabia, up +5.1% y-o-y
I am not sure if all the other exporters can meet capacity at a rate favorable to China. I would have to do more anyways... But they do still largely rely on KSA...who is really the head of OPEC and defacto sets the policy here.