Wow, previously you were comparing the past 15 years time frame, and now you move even earlier to a 30 year time frame. FYI, China started buying Soviet weapons only after the collapse of Soviet Union, the period between 1969 - 1989, China had a strained relationship with Russia. That's the reason why we only bought Mig-19/21 until until 1969. So if you like to compare, you should compare the 90s when we actually started repurchasing Russian weapons.
Almost all Indian purchases since the 90s was a reaction to Chinese purchase if you study it closely. I don't care about what you planned, it never materializes anyway. The question is India is always trying to copy Chinese footsteps. We had Olympics, you went for Commonwealth, We get bullet trains, you want bullet trains, you know what is more pathetic than a copy cat? It's someone copying the 'copycat'. OTOH, China is always trying to copy Western footsteps and trying to match their capability, my advise is why do you compare to China, try to set your benchmark higher, go against the best.
Btw, there were report India secretly bought S-300 missiles.
http://thediplomat.com/2013/08/indias-missile-defense-is-the-game-worth-the-candle/