The Russians supplied India with armaments when America refused to sell them to the latter, and even forced Britain to stop such sales - one of the Soviet premiers famously gave India’s Nehru tours of Russian aircraft factories with promises of supplying India with the latest of Russian weaponry - at a time when the West refused to entertain any such efforts.
The American bet was on a religiously “cohesive” Pakistan to survive over the long term, in comparison with what was thought to be a very unstable, secular India. On top of that, the Russians quite early on shored up support for India in booting out French and Portuguese territorial claims from within her territory - especially Goa.
Things turned out quite differently, for all parties, through the years. India, no doubt, acted in India’s interests and stuck with it.
Goa wasn't Indian territory. When the Indians invaded, the Goanese fled in droves. The Indian position on Japanese war criminals was that the Japanese perpetrators of Bataan and various other atrocities against Americans and Europeans in the Far East were being railroaded. Indian leaders spent much of the war snuggling up to Imperial Japan, and Mahatma Gandhi was a pretty big fan of Nazi Germany.