Yes, I am agree with you that China still one step behind russia regarding Turbofan Engine, especially TVC Engine.
But if we talk about Warships Engine, China is much step ahead in Front of Russia. That's what you need to admit too
@ptldM3
About Kamov Cooperation with CAIC to Design Z-10, that's happen in 90s. Yes, China is back then in that time. But, that's only design, Radar Avionics and Weapons System is using their own technology (and we still don't talk about China's Better Avionics and Radar system compare to Russia)
China buy SU-35 because that's the requirement from ROSOBORON if China want to get 40N6 on their S-400 SAM. That's why China only buy 24 unit SU-35 not hundreds.
SU-35 still using less Advanced PESA Radar, mostly China's Modern Fighter now already using more Advanced AESA Radar.
In cold war time, US also buy many Soviet Aircraft for Test & Evaluation, but that doesn't mean they cannot make better aircraft then soviet union. China will do the same, especially because some of his Un-friendly neighbour is using Russian made aircraft.
And you must be remember, China dump SU-27 Licence Contract in 2000s, because Russian Avionics and Radar System is very Obsolete compare to Chinese one.
Regarding Stealth Fighter, Your T-50 PAKFA have many issues. Even India decide to ditch their Stealth Fighter Program with Russia.
http://www.thedrive.com/the-war-zon...tched-its-stealth-fighter-program-with-russia
I am also interested in Russian Aviation and have positive Impression with your country development, but I think you need to be more Objective and neutral regarding this issue
@ptldM3
Best Regards