Ah, I did miss that point. There are some practical difficulties for oil at least. Russia doesn't have pipelines that connect all their oil facilities to China; the facilities that do connect to China are pretty high-tech, have depended on western companies for maintenance, and don't have a lot of spare capacity. To get the oil from other regions, they'd have to rely on ships, either from China and Russia or any other countries willing to flout sanctions. (This is according to Peter Zeihan.)