The MKI that was introduced in 2007 was Su-30MKI Mk3 as well. Mk1 was A2A only, then came Mk2 with A2G. Mk3 came with new avionics, including a finished EW suite, radar processor upgrades and so on. We could already be on Mk5 or Mk6 right now.
T-90 should have followed a similar pattern. I guess the version with the new driver's night sights and new missile was Mk-II. Or it could be for this one, delivered from 2009.
With every upgrade we indigenize more parts and enhance the capabilities of our military ware. Su-30MKI upgrade is touted to be 78% indigenous. Same could be true for T-90, me thinks.
Tests of the Russian T-90S tank in India in 1999. Archival footage of the Russian Uralvagonzavod. Tests on May 17, 1999 in India of the Russian T-90S tank. It was a difficult time for the plant at that time; one might say that the contract with India saved the plant. In 1997, India showed interest in the T-90S tank. But India needed a tank with a 1000-horsepower engine and a thermal imaging sight. At that time, the Russian tank did not have the required characteristics, but the adaptation of the tank and the revival of production took place in the shortest possible time at Uralvagonzavod. Tests were carried out in the Thar desert, each tank traveled more than 2000 kilometers. The V-92S2 "ChTZ-Uraltrak" diesel engine demonstrated phenomenal endurance. The tests were completed successfully. In the early 2000s, 124 tanks went to India in finished form and another 186 in the form of vehicle kits. And in 2004, the first Indian-assembled T-90S tank was released.
The Indian Army is inviting Requests for Information (RFI) from interested bidders to undertake the manufacturing of 125mm Armour Piercing Fin Stabilized Discarding Sabot (APFSDS) ammunition in India.