Axis

Tripartite Pact Powers

 * Nazi Germany
 * Kingdom of Italy
 * Empire of Japan

States that adhered to the Tripartite Pact:

 * Kingdom of Romania
 * Kingdom of Hungary
 * Slovak Republic
 * Kingdom of Bulgaria
 * Independet State of Croatia

Co-belligerent states:

 * Republic of Finland (see Continuation War)
 * Kingdom of Iraq (see Anglo-Iraqi War)
 * Kingdom of Thailand
 * Soviet Union (see Invasion of Poland)