Comparing: IS-2 vs. IS

Soviet IS-2 tanks were exported to China in the early 1950s and were used during the Korean War from 1950 through 1953. According to U.S. reconnaissance data, at least four Chinese tank companies deployed in Korea had the IS-2 tank, with five tanks in each company. The IS-2 remained in Chinese service until the late 1950s. Production was discontinued due to a shortage of spare parts and the launch of the Type 59 project. A few IS-2 tanks were exported to Vietnam, where they fought in the final stage of the Indochina War of 1946–1954.

The IS-1 (IS-85) heavy tank was a thorough modernization of the KV-1. The tank featured the 85-mm D-5T gun. The IS-1 entered mass production in October 1943, but work was discontinued at the beginning of 1944, as the IS-2 (IS-122) tank entered mass production in December 1943. A total of 107 vehicles were manufactured.