kv-1
Soviet heavy tank at the beginning of WWII, equipped with the same 76.2mm gun as the T-34 while being around ~15t heavier. Its armor was enough to survive the majority of german AT guns during the early part of the Eastern Front. Gradually replaced in later years of the war. A number of derivatives were also built on the hull, such as the KV-2 (armed with a 152mm howitzer).