The Chinese military do not seem to plan stepping in, rather they expect a long war of atrition, where Russia is learning from its mistakes and adapting to new realities. Perhaps it's just a diplomatic offensive - it may turn into real help, but I doubt it is happening anytime soon.
Here's an article from a mouthpiece of the Chinese military - they actually think Russia will NOT launch an offensive now. Google translate it, if you don't know Chinese: https://m.guancha.cn/WangShiChun/2023_02_19_680480.shtml
The Chinese military do not seem to plan stepping in, rather they expect a long war of atrition, where Russia is learning from its mistakes and adapting to new realities. Perhaps it's just a diplomatic offensive - it may turn into real help, but I doubt it is happening anytime soon.
Here's an article from a mouthpiece of the Chinese military - they actually think Russia will NOT launch an offensive now. Google translate it, if you don't know Chinese: https://m.guancha.cn/WangShiChun/2023_02_19_680480.shtml