Answer by Anudeep Ravi:
Because the West was very unhelpful compared to Russia.
1950's. Newly Independent, Completely Non Aligned, India was Asking around for help in setting up Dams, Institutions and Factories to Build Itself up.
We got nothing from West other than proposals of trade agreements for Raw materials ( Heard of colonialism?)
1 . Helped in setting up Steel factories like in Vishakapatnam, (Which the west did not want, because we might make weapons)
2. Lent technical Expertise in the construction of Dams for irrigation in a Famine torn India,
3. And Set up Educational Institutions which are considered best in the country, One of which I am Studying in Right now. Hell, the equipment I used in my first year was Russian, Which was Given in 1960's.
Compared to this, What did USA and the west even do?
And USA was Firmly with Pakistan, Which pressured India to closer ties with Russia.
Take 1971 Bangladeshi Liberation. USA threatened India with Nuclear Weapons when there was a Genocide going on and Pakistan attacked India.
If not for Russia, We would have been Nuked.