The ZSU-37-2 Yenisei was a late 1950s Soviet self-propelled anti-aircraft gun. The development of the Yenisei started in April 1957 as it was obvious that the then new ZSU-57-2 was not a very capable SPAA, especially lacking accuracy and search-and-track radar. A modified SU-100P tank destroyer chassis was chosen as the basis of the vehicle. The Yenisei was codeveloped together with the ZSU-23-4 Shilka, although the Shilka's role was to protect mechanized infantry regiments from aircraft up to 1,500 m of altitude, while the Yenisei was tasked with protecting tank divisions and regiments and engaging targets up to 3,000 m of altitude. During trials, the Yenisei proved capable of firing on the move up to speeds of 25 km/h on even and flat terrain. The accuracy of the 37 mm 2A12 was also 2.5x higher than that of the ZSU-57-2. After the trials, the Yenisei was retasked with protecting 2K11 Krug and 2K12 Kub SAM systems from attacks inside the missile launcher dead zones. The Yenisei was recommended to be accepted into service, however on 5th September 1962, the Council of the Ministers only accepted the Shilka into service. All work on the Yenisei was stopped shortly after.

The Yenisei was introduced in Update "Hot Tracks". Over the Shilka, the Yenisei offers greater range against aerial targets and higher penetration values against ground targets at the cost of rate of fire. The Yenisei is also much more agile and faster than the Shilka, while also being on a chassis with a lower silhouette. The radar however is not very good, and due to the very narrow scan pattern (only 15 degrees vertical) has issues detecting higher flying targets, and aiming must be relatively precise when locking onto targets.