I really don’t see China being dumb enough to risk Russia level sanctions. They will not send troops unless sufficient coercion and circumstance make western involvement unthinkable.
They have very little experience in that and, what's more important, their armed forces exist mostly to keep their own population in line, as evidenced with the events at Tiananmen square.
Pretty sure the purpose of their army is to be an army, like pretty much every army.
They spend similar %GDP as the US does on military on their own internal security. Huge money sink.
going to be a rather unenthusiastic army if it is stocked with folks who thought they were getting cushy office jobs.