Since there is a Kindle store on Amazon IN, I suppose there's some hope that they will eventually accommodate other languages, but they haven't been in any hurry to expand beyond European languages with the exception of Japanese (and that only on the JP store).
(There is now "beta" support for some Indian languages, but it seems to be giving problems, like all things beta.)
I'm curious what the beta issues may be. Some of the Indian writing systems are syllabic, or have variant forms and idiosyncracies, that might make them harder to machine read. But that's not the excuse for Russian or Greek, which have stable, invariant writing systems with distict printed-form letters. The Iranian languages, as well as Urdu (the Pakistani variant of Hindi) are written in the Arabic alphabet, which may also be problematic. That's on top of political and religious issues that go beyond the merely technical.