Pretty sure India is mostly selling Russia’s old arms back to them. The new stuff should probably be interpreted as an attempt to build a counterbalance to China in the region (as in deliberate, longstanding US defense policy).
India is selling classic weapons to Russia. They are buying Reaper drones from America (likely to bomb Kashmir with)
The interesting part here is the price. India is making the 4Billion they spent on American weapons back by selling weapons to Russia.
As India is in BRICS they might not be the most effective counter to China.
BRICS is a meme. It was a term a Goldman Sachs researcher used to describe developing economies that are worth investing in.
Brazil is a basket case, S Africa is basically a failed state, India and China are rivals, and Russia is eviscerating itself in Ukraine and turning into China’s Canada.