It's true that Russia and China share a border, but the infrastructure to move oil across it at large scale barely exists and I got the impression the geology is very unfavorable for it. It's probably easier to ship it, but future pipeline expansions may still happen.

The whole Belt and Road initiative seemed to mimic a Korean style labor export to increase the inflows of currency into the country while keeping people employed, but I also kind of figured it was aimed at reducing the friction of future resource transportation between the countries.