That's why you buy and build Russian subs, carriers, fighters, helicopters, transport aircafts, weapons...
What do you think they take your money for? Exactly, to develop more capable subs, carriers, fighters, helicopters, transport aircafts, weapons...for their needs. Both China and India are not as capable as Russia today and they need our money, so it's a give and take and since the Russians know that at some point our countries might not need them anymore, they lean towards S. America and Europe now.
To some extent, they utilize us, we too, China and India both import many weapons from Russia, beform we are No.1 importer of Russia weapon, Now it is you, but the question, Who learn more and faster from foreign weapon? China or india?
And to a large extent, Russia are live on past, after USSR collapsed, after 20 years, China catch up with Russia in some military domains.
That's the problem, they don't offer you such high end joint projects, since you proved to not be reliable enough to them. That's why you had to go to Ukraine to get a older carrier and the necessary know how on how to develop carriers or navalise the Russian Flanker.
For India instead, Russia offers co-developments of naval Pak Fas, or nuclear carriers, which shows the difference of relation to Russia.
Do you know in where is the shipbuilder that building most of USSR carriers? and all know that the training central for carrier of USSR lied in Ukraine, and UKraine have many advanced single technologies, many advanced equipments that left by USSR, all these are we need, and it is easier to get, why not, beside Ukraine, Belarus also have many advanced single technology, I know you india look down on these "outdated" technologies, but we want them, we are glad to pay for it, hehe!!
About the so-called India-Russia joint project, seems you are very happy for these, you just pay money, most of work is did by Russian scientist, you can get all technologies? even you can, you can design and finish the similar project alone later?
Just one question, How many have you learned from these Joint projects and countless global tenders with TOT?