No, they don't because Russia depends on the US like all countries do. Back in the USSR days they got 70% of their wheat from us. At a discount. Russia, like the rest of Planet Welfare, remembers what life was like before Truman decided to remake it in the image of the Gods known as Americans.
China has no desire to go to war with the place that made it rich. That would be like the Prodigal Son killing his daddy. BEFORE he got the money. They'd be better off just nuking themselves to get it over with if they were that suicidal.
Also, China can't risk going to war with anyone major, as they can't grow enough food to feed their masses (sheesh, they need us even for soybeans and buy rice from us too) and stripped themselves of most resources when Europe was still in the caveman stage.