Good morning, gentlemen.
Some Soviet interwar aircraft with radial engines. During WW2, the Soviet Union used 2 main families of radial engines: Shvetsov (derived from the American Wright Cyclone) and Tumansky (derived from the French Gnome et Rhone 14K), the former being more prevalent than the later by a good margin.
The prewar soviet doctrine for fighters was of two types of aircraft, one high performance monoplanes and another line of biplanes of excellent handling. Polikarpov I-190 was an attempt to push the performance of the biplane almost at the level of the monoplane but without lossing the handling characteristics. With more refined aerdynamics the the predecesor I-153 and a powerful 1100 hp Tumansky radial, the aircraft was able to reach almost 500 kms/h in late 1939. Unfortunatelly, the engine overheats badly, and that problem was not resolved until the crash of the prototype in 1941, and that was the end of Polikarpov´s biplane saga.
Tupolev ANT-31 was an early competitor of Polikarpov I-16. Ant-31 had good performance but was a tricky aircraft to fly. Initially, this model was armed with recoiless guns, but as they proved to be completelly unreliable, the former were replaced by more conventional machinge-guns. With the selection of I-16 as the standard monoplane fighter, Tupolev´s model was shelved.
Tairov Ta-3 was the prototype for a heavy twin engined fighter. With a good performance and excellent handling, it was a promising model. Unfortunatelly, with the begining of Barbarossa, there was a severe delay in the production with the evacuation of the Soviet war effort to the East. Worsening this, the designer Tairov was killed in an airline crash, traveling between Moscow and Kuybyshev, in December 1941. After this, the model was shelved.
Tupolev ANT-35 was a twin engined passanger monoplane derived from the well known SB bomber. It was very cramped inside, and despite being fast, it was decidedly inferior to the American Douglas DC-2, which had twice the passenger load, longer range with exactly the same powerplant. After less than 20 aircraft, the production was stopped.
After WW2, Yakovlev introduced a modern all metal aircraft a light transport to service low-volume destinations too small to justify a Lisunov Li-2. Powered by a pair of Shvetsov ASh-21 7-cylinder radial (which was a single row version of the twin row, 14-cylinder Shvetsov ASh-82), 2 prototypes were built, one civilian and the other military. Despite having good characteristics, the aircraft was not selected for production, as the Antonov An-2 biplane was thought to be more versatile.
Finally, a widely used little seaplane, the Shavrov Sh-2. Equiped with a low powered 5-cylinder engine, was used in the interwar, during the war and the postwar Soviet Union.
Cheers!