A lot of Russia's armor consists of dated T-72s, a small number of which are being upgraded, but those upgrades are basically "Add a thermal sight, make the turrent turn a little faster, add some ERA brickes". Armata is really a unicorn, T-80s got pulled out of service, and they rely on T-90 variants just like India.

Whether or not M1A2s are equal or inferior to a tricked-out T-90 is a long, long debate.

There is also China, but I personally don't think much of their new tanks.