IS 7 the best russian tank Pillow

IS-7 was a prototype Soviet heavy tank, which followed the IS series. The development of the machine began at the Kirov plant in Leningrad in the spring of 1945. All prototypes underwent military tests. The prototypes left the Leningrad plant in 1946 and 1947. It was a massive machine armed with a 130 mm cannon and eight machine guns, two of which were large-caliber. In the end, the tank was not accepted into series production, but much of the knowledge was applied to later types of Soviet tanks. source wikipedia