In the period from the end of 1937 to 1940 the Soviet Union was the primary supplier of military aircraft to the Chinese Air Force, supplying 536 fighter planes; some of the planes were flown by Soviet volunteer military pilots sent to China.
The Soviet Union was the primary supplier of military aircraft to the Chinese Air Force, supplying 536 fighter planes. This was in the period from the end of 1937 to 1940. Some of the planes were flown by Soviet volunteer military pilots. These Soviet volunteer military pilots were sent to China.