IS-3

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. Too late to see combat in World War II, the IS-3 participated in the Berlin Victory Parade of 1945, in the border conflict during the Sino-Soviet split, the Soviet invasion of Hungary, the Prague Spring and on both sides during the Six-Day War.

Source: Wikipedia