I think China will sit this one out. There's nothing to gain for them with direct involvement.
Any assistance to Iran (like satellite imagery) will have limited effect, and the Chinese know it. In my opinion, there's no way the Islamic Republic survives this. For any rational international actor, there's no sense in becoming involved in a lost fight.
> In my opinion, there's no way the Islamic Republic survives this.
But what if the Islamic Republic isn't a material thing, it isn't a government apparatus, it is actually the ideas and culture of a population under siege? 50-60 million Persians, and another 30-40 million muslims of other ethnicities. They have been embargoed for decades, the message that the US and Israel are evil has seeped into every corner of society there. It will not be so simple to erase that programming and you can expect a large portion of the population to resist to the bitter end. It's been over 20 years of planning to bring the USA to this point, 20 years because it was never a sure bet, and even today it's still not clear who wins. No, I think 4 days in it's too early to call winners and losers.