The LaGG-3-35 was a modification of the LaGG-3, a Soviet single-engine fighter designed by the OKB-301 design team (S. Lavochkin, V. Gorbunov, and M. Gudkov). Numerous changes were made to improve the aerodynamics of the 35 series aircraft: automatic slats were installed and a Pitot tube was added to the right wing. The tail wheel became retractable, and the air intake size increased. The 35 series aircraft were produced from August 1942 to spring 1943 at Aircraft Factory No. 31 in Tbilisi. The LaGG-3 was used extensively by the Soviet Air Force during World War II and saw combat against Japan in 1945. A total of approximately 800 Series 35 aircraft were built.

The LaGG-3-35 has been in the game since the start of the Open Beta Test prior to Update 1.27. Like all LaGG-3 fighters, the aircraft has powerful weapons and decent speed but lacks maneuverability. Another issue is the limited ammunition, requiring the pilot to be precise when firing weapons and dropping bombs. These characteristics make dogfighting or attacking ground targets difficult for LaGG-3-35 pilots.