An artist's impression of a KV-5.

The KV-5 was a cancelled Soviet pre-prototype super-heavy tank developed during WWII. It was to be armed with a 107mm ZiS-6 in a large turret with a machine gun in a smaller secondary turret. Its weight was planned to be 100 tons, with 150-180mm of armour. No prototype was built, and the project was cancelled due to the Siege of Leningrad.