T-70
The T-70 is probably the cutest tank available to the soviets in WW2, mounting a 45mm cannon and 45mm of armor on a chassis that didn't even quite reach 10 tons. Designed as a tank that even the smallest of factories could produce, the T-70 was powered by twin truck engines and given a 2 man crew to limit its size and weight, then produced in massive numbers. This translates to a tank that is exceptionally cheap but relatively impotent, though it can prove to be a useful addition in ways other than raw damage potential.