IS-3 is a heavy tank developed by the Soviet Union during World War II. It was one of the most powerful tanks of the war and was the first to be equipped with a 120mm gun. The IS-3 was the last of the Soviet heavy tanks to be produced and saw
From Wikipedia
The IS-3 is a Soviet heavy tank developed in late 1944. Its semi-hemispherical cast turret became the hallmark of post-war Soviet tanks. Its pike nose design would also be mirrored by other tanks of the IS tank family such as the IS-7 and T-10. Produced too late to see combat in World War II, the IS-3 participated in the Berlin Victory Parade of 1945, the Soviet invasion of Hungary, the Six-Day War, Yom Kippur War, and one was used during the early stages of the Russo-Ukrainian War.