So the Russians who are at this point highly dependant on Daddy Xi to keep their economy and military afloat are gonna false flag the West to suck China into a quagmire of a war a few months before the most unpredictable and venomously anti-china president (who has thin skin, a hair trigger, and no qualms about conducting airstrikes on high-ranking Iranian generals unilaterally on a whim) in modern US history is about to take office at the head of a country with the largest functioning stockpile of nuclear weapons and a massive military? You think Chinese intelligence is asleep at the wheel and wouldn't notice given the stakes and absurd levels of geopolitical risk the entire planet is at?
China may back Russia to try to shift perception of the west's military might/will or to drain resources or just to buy Russia by making them dependant to get those juicy Russian natural resources but they aren't going to start world war iii to help Putin with his fetishistic "yet another European dictator" fantasy.
The Chinese know how to play the game same as the Russians and the US. All these little games are just calibrated psyops, why destroy, very publicly, comms lines when tapping it would be far more beneficial to a war effort and much quieter? Maybe to make the West look weak and unable to defend their borders which affects consequences domestically like say channeling political support to isolationist politicians who want to retreat from supporting Ukraine? Cause those politicians didn't make gains in the last European elections or nothing.