50 Roubles Heavy Tank KV-2

The KV-2 was developed in direct response to Finnish fortifications encountered during the Winter War of 1939–40, where standard tank armament proved useless against reinforced concrete bunkers. The design was rushed — Kotin's team at the Kirov Plant had a prototype running within days of receiving the requirement. Its enormous turret made it catastrophically top-heavy, prone to tipping on uneven ground, and the turret ring frequently jammed if the vehicle wasn't parked on level terrain before engaging.

Production ceased in late 1941 after most of the fleet was lost not to enemy fire but to mechanical failure and fuel shortages during the chaotic German advance.