The Chinese military stopped US forces cold during the Korea war, a feat the Russians never accomplished. Chinese contributions in material, training and personnel led to Vietnam's victory during its war. Until Ukraine Russia was unable to take and hold territory after WWII. China's accomplishments in cyberespionage against the US are unmatched, and you won't find Chinese hardware running global telecom networks. Everyone relies upon Chinese manufacturing for the elements of basic military supply. In sum, Russia presented a real danger of global war by accident or incompetence. China presents a real danger to its neighbors for reasons that would make this post tl;dr.