Seems China and Russia already fixed the design of their JV Widebody C929, and begin to moving on development stage. This design seems will face 787 and A330 Neo. However if the range 'only' 12000 KM, then it will face uphill battle on International market against those two who have 13500-15000 KM range.
I suspect China with more deep pocket financing company will be task more on market this plane internationally. However both Russia and China will have to prove availability of their support network chain. Both Russia and China has competing products on narrow body with C919 and MC-21, and Regional Jet with Superjet and ARJ-21. Thus building cohesive network support chain for their aircraft, will be interesting to watch on how they solve that.
Both Airbus and Boeing already build their supply chain globally for decades. This's one of the entry barriers for other manufacturer to try come into International Airliners market. This infact one of the reasons why the market remaining mostly Duopoly control for more than three decade already. I don't see other non China and Russian Financing company willing to bet and financing procurement for Superjet, ARJ-21, MC-21, C919, and this C929, unless they see Russia and China able to provide support infrastructure globally for their Airliners.
Both China and Russia has to work together to build that, if they want to be seen as serious contender against the Duopoly.