Russia's oil reserves are a drop in the bucket compared to middle east, and more expensive to extract. Saudi Arabia could simply ramp up production to drive prices down globally and make it not worth the effort. Also, US has leverage over China bc they buy all China's cheap crap.
The headaches and downsides aren't worth it, and any "talks" are likely just game-theory pokes at the US.
"Perception is reality", and it's super true in investing. It's in Russia's and China's (and India's, and others) to weaken the dollar and the US' role in global hegemony.
To that end you keep stoking the fire, keep raising the question.