Why did Great Britain and France declare war only on Germany but not the Soviet Union after both occupied parts of Poland in 1939? | AskHistorians Archive Observer

Why did Great Britain and France declare war only on Germany but not the Soviet Union after both occupied parts of Poland in 1939?

by BurtTheTurd

Georgy_K_Zhukov

More can always be said, but this older answer might be of interest for you.