I dont think Russia need any money from India nor it will share what they consider high tech. see this happy face meeting about AI with a banker. this latest upgrade of Su-57 is an AI. This how you get info about advancements. they put face on specific topic.Don't disagree with you, but UAC could certainly benefit from a CAPEX injection from our Bharati bhais so they may refine the Su-57 into an indisputable, if not legitimate 5th gen fighter.
The Combat Approved on youtube few years ago mentioned that upgraded MIG-31 is fully cleared for Mach 3 missile launches at 70K feet. Su-57 few dozen aircraft per year it will get best components and material science upgrades (They already call it 5.5G fighter) which Ukraine is now discovering from Onyx missile strikes thinking it a hypersonic.