You don't have to worry those MKI, cause China is gonna get customized version of SU35 very soon. lucky part is that SU35 will be deployed at east front not south. As India and USA get closer these days, i think Russia will sell more advanced weapons to China.
What exactly is the feeling that a friend you trust keep selling better weapons to your rivalry? meanwhile, FGFA is not making any realistic progress. I think India is more like a cash cow taken granted by Russia,and China is always the smart business man.