Can China do partnerships the answer is yes, but to do them you need partners who trust you
China only real partner in Military isssues is Russia but they could do more partnerships with the US for sure in civil aerospace.
Why do partnerships? first is not to multiply programs that will requiere more money to each single company and some which might fail.
Second is market, you increase your market.
Russia in many was has been isolated because first their jets only have russian engines except Sukhoi Superjet and the future MS21.
How well their engine will become i do not know but their risks is their engines might not come on time an might become economically ineffecient since the other side is also investing in technology.
If they are successful they will get a great capacity but for for sure is not the west to blame, if you want is both sides that still have mistrusts and issues in order to do engines in joint ventures.
But if China wants tech trasnfers they will need another policy since the one they have has limits.
Oh... stop embaraess yourself as of now, your integrity had just hit pass zero.
Okay, lets look into your argument.
Have you heard of the arms embargoment? Don't tell me it is because those that impose the embargoment to China because China copy their products. If that was the case, they would simply stop selling products to China instead of coming up with an embargoment and frankly speaking, I believe the Western companies would have wanted to sell their weapons to china. It is business.
Secondly, the Japanese and Germans and American and Koreans, etc had no trouble setting up automobile join venture with China... you go figure out why.
Thirdly, need I remind you, Boeing and Airbus had manufacturing lines in China. If they are that afraid of China copying, they would not have that... and if they are that afraid of China copying, why in the world would they even sell aircraft to China? Since China could copy everything.
Oh... and you argue that those things done are for civil aerospace... what a laugh...
As to why do partnerships, you ask. There are again multiple reasons for that. Market size is one of them, but if I can do everything myself and I would have 100% of the market to myself, why do I want a partner? Politic is another, because I might need a partner from that nation before I can get in, and that is not something to do with not having enough technology. To pull down the investment cost, as in all business, so instead of investing 100%, I get a partner and that would lower my investment cost to... say 60% or whatever the contract might state and that is common in the business world too.
Seriously Mig 29... I am surprise of all the arguments you put forth... first you talk about how good the Russian are (they really are, I am a big fan of the Sukhoi series of aircraft, by the way), then you talk about how good the Mexican are... well I have no comments in that because I do not know, somehow you add India to the equation... while all these nations are doing great, they are honest, they have no problem... but China is nothing but copier of others work? Seriously? You basically discount every achievement China had in aerospace engineering... every single aspect (although you sugar coated it abit), then stirred up others emotions in that. I mean, what is the motive behind all these? Why are you doing that?
Also... please stop coming up with what Russian chief designer say, some test pilots verdicts on Russian plane (btw, those test pilots are Russian test pilot working for the company that designed that plane). All these are nothing but sales pitch. We could easily come up with heaps in youtube of Chinese designers and test pilots (or actual pilots) who would say that J-10, J-11B and all other Chinese fighters are the best aircrafts around.
Now you are touching on business aspect of stuff? Oh... come on...