Can you give a single exemple where china is/will investing in a russian aviation military project or inversely?
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Look, your vision is Kamov`s help is a disgrace, China is weak is obvious what view permeates.
In my opinion, and going by realistic economic aspects is.
Can China design Z-10 by it self? yes they can, absolutly they can design the whole aircraft.
The problem lies in timing and price.
Kamov allows Z-10 to reduce development time, that also means less money in R&D for China and means China can concentrate in more social programs like creating jobs or increasing investment in social programs.
By reducing time means China can get a Z-10 competive in time, it means the Helicopter flies with contemporary aircraft with a relatively good position for exportability and combat effectiveness.
Being an ally it does not mean you can not go togather or alone, Italy designs A-129 and Tiger is a German-French program.
Germany can develop a helicopter by her self, no doubt about it, but by doing it in joint ventures you get price down and lower risks loses.
Russia in the 1990s was not able to buy even Mi-28, so Z-10 was out of the question.
So China went alone and now Russia wants to consolidate its aircraft industry to have better footing in joing ventures.
China is the same, however you are unrealistic to think they won`t do joint ventures, because the fact China has built in 10 years less J-10s than what the US has exported F-16s and F-18s show you how burdensome is aircraft financing.
Building J-10s or J-11 is expensive because they only spend money, money is only recovered if you export those jets.
But as ARJ-21 shows, going alone is hard.
So what China and Russia are doing is stregthening their respective aviation industries so they will be major partners in joint ventures.
Rafale is a good example, if one nation wants to be a leading partner, then the joint program might fail, but as Eurofighter shows is better always jont ventures because as time passes aircraft prices go up and aircraft purchased go down.