Not directly related but if *Russia* is 10 years behind the world in commercial aerospace technology (even before the tech bans); doesn't that mena that China is decades away from being able to make a workable commercial airliner on the scale of the A320 which was deployed by Europe *50 years ago*?
This isn't a game of age of empires where someone researches chemistry before you.
Commercial aerospace requires a multitude of technologies, materials, advancement, prototyping, testing etc to end up with something.
I wouldn't be surprised if China were close to 2 decades behind atm given the circumstances. No input (example) from Honeywell etc and the slew of american sub-component manufacturers.
That's not in itself a bad thing in terms of self-sustainability, if focus was given.
Certain countries are at certain levels. The japs probably have better matsci than the Americans, who don't have the due diligence, but the money and research necessary to plough through.