Here are the countries that participated World War 2 but didn't joined the Allies, or eather Axis (even that most of the countries on this list actually joined the Allies some years later)
Here are the countries that participated World War 2 but didn't joined the Allies, or eather Axis (even that most of the countries on this list actually joined the Allies some years later)
Сою́за Сове́тских Социалисти́ческих Респу́блик
Joined the war on: 17 September, 1939
Беларуская Савецкая Сацыялістычная Рэспубліка
Белорусская Советская Социалистическая Республика
Joined the war on: 17 September, 1939 - Non-Official Belligerant - Republic of Union of Soviet Socialist Republics
Українська Радянська Соціалістична Республіка
Украинская Советская Социалистическая Республика
Joined the war on: 17 September, 1939 - Non-Official Belligerant - Republic of Union of Soviet Socialist Republics
Suomen tasavalta
Joined the war on: 30 November, 1939
Laikinoji Lietuvos vyriausybė
Joined the war on: 23 June, 1941
Українське Державне Правління
Joined the war on: 30 June, 1941
کشور شاهنشاهی ایران
Joined the war on: 25 August, 1941
Ukrainian Insurgent Army
Українська повстанська армія
Joined the war on: 14 October, 1942
Prvá československá armáda na Slovensku
Joined the war on: 29 August, 1944
Suomen kansanvaltainen tasavalta
Joined the war on: 1 December, 1939 - Puppet State of Union of Soviet Socialist Republics
Eesti Nõukogude Sotsialistlik Vabariik
Joined the war on: 7 July, 1940 - Puppet State of Union of Soviet Socialist Republics
Latvijas Padomju Sociālistiskā Republika
Joined the war on: 7 July, 1940 - Puppet State of Union of Soviet Socialist Republics
Lietuvos Tarybų Socialistinė Respublika
Joined the war on: 7 July, 1940 - Puppet State of Union of Soviet Socialist Republics
Latvijas Republika
Latvejas Republika
Leţmō Vabāmō
Was invaded by the Soviet Union: 16 June, 1940