Finnish
- Fighters
- Bristol Bulldog Mk.IVA
- Fiat G. 50
- Fokker D.XXI
- Gloster Gladiator Mk.II
- Morane-Saulnier MS 406
- Bombers
- Bristol Blenheim Mk.I
- Bristol Blenheim Mk.IV
- Douglas DC-2
- Reconnaissance
- Blackburn Ripon IIF
- Fokker C.X
- Fokker C.VD
- Fokker C.VE
- Junkers K.43
- Koolhoven FK-52
Swedish
- Fighters
- Gloster Gladiator I
- Bombers
- Hawker B-4
Soviet
- Fighters
- Polikarpov I-152
- Polikarpov I-153
- Polikarpov I-16
- Bombers
- Ilyushin DB-3
- Tupolev SB
- Tupolev TB-3
- Reconnaissance
- Kharkov R-10
- Polikarpov R-5
- Polikarpov U-2
The Soviet invasion of Finland was a result of the Molotov-Ribbentrop Pact, signed in August, 1939, between Stalin and Hitler. Although it was presented to the world as a non-aggression treaty between their two nations, the pact included a secret territorial protocol dividing eastern Europe into Nazi and Soviet spheres of influence. Hitler wanted to ensure that he could attack Poland without provoking a war with the Soviet Union, because Britain and France had already promised to declare war against him if he attacked the Poles. Stalin wanted to secure his western borders by regaining Russian territories lost after WWI. Their secret protocol assumed "territorial and political rearrangements" that resulted in the invasion of Poland in September, and its division between Germany and the Soviet Union. After Stalin had secured eastern Poland, his attention turned to the Baltic states and Finland, also in the Soviet sphere. The Baltic states, feeling they had no alternatives, agreed to allow the Soviets to station troops in their countries, but the Finns refused and the Winter War was the result. Fearing Bolsheviks reaching their borders, the Swedes provided discrete military assistance to the Finns, as did several other nations.
