>>63813058 (OP)1. Ditch the carousel autoloader, preferably in favor of a cassette autoloader mounted in the turret bustle, but if not just get rid of it. The commander can double up as a loader. Sure, the rate of fire will be abysmal and the tank's already awful situation awareness will get worse, but it is what it is. Blast doors and blowout panels are probably asking for too much, but wet stowage shouldn't be.
2. A goddamn transmission that can do more than 5kph in reverse. This seems like something the Soviets should have fixed with the T-44, but it's 80 years later and here we are.
3. You're sanctioned to shit, so good quality optics, electronics, and sensors are out. I guess try to get the best of whatever dual-use stuff is available, but for the love of shit, install it correctly. You had access to the good Western shit prior to 2014 and still managed to waste it by letting alcoholic retards do the wiring. Hire foreigners if necessary.
4. Some sort of up-armor package. Like actual armor, not a cope shed. And designed by one of those engineering bureaus you guys love over there, with testing and math and everything. Nothing fancy, nothing cutting edge, just good ol' fashioned NERA and lots of it. The T-90 has a worse horsepower-to-weight ratio than the Abrams despite weighing 25 tons less, and adding additional armor isn't going to help but it's not like you're going to be doing maneuver warfare anytime soon. The automotive components won't like it, but the goal here is to get the tank to survive long enough that a broken torsion bar becomes an issue.
5. Oh, and cut a fucking hole in the back so the turret bustle can be accessed from inside the fucking tank. That Potemkin village shit you have going at the moment isn't even funny, just sad.
With all that, you should have a tank that's nearly the equal of an M1 Abrams baseline or Leopard 2A0