Wow, pardon my ignorance. There's a whole wikipedia article on India Russia relations [1]. (I then checked how many bilateral relation articles there are, turns out a lot but clearly not exhaustive). there's a lot to the India Russia relationship dating back to the cold war and it's a close tie.
Pardon my silly US lack of knowledge
[1]: https://en.wikipedia.org/wiki/India%E2%80%93Russia_relations