Why Didn't the Allies Declare War on the USSR when it Invaded Poland? (Short Animated Documentary)

As you'll know World War 2 (in Europe) began with Britain and France declaring war on Germany after it invaded Poland. But when the USSR invaded soon afterwards, the allies did nothing. But why? Why was there no declaration of war on the Soviet Union? Find out in this short and simple animated history documentary.

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A special thanks to all of these Patrons below, without whom the show wouldn't be possible:

Franco La Bruna
Kevin Sanders
Chris Fatta
Richard Wolfe
Gregory - The Bittersteel
Stefan Møller
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SirAlpaka
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Tristan Kreller
Jane Sumpter
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Nick Finan
Colin Steele
Gabriel Lunde
João Santos
Christine Purvis
Konstantin Bredyuk
Big Nick
Donald Weaver
Steve Bonds
Seth Reeves
Pierre Le Mouel

Sources:
British Reactions to the Soviet Occupation of Eastern Poland in September 1939 by Keith Sword

POLAND IN BRITISH AND FRENCH POLICY IN 1939: DETERMINATION TO FIGHT—OR AVOID WAR? by ANNA M. CIENCIALA

Choosing Not to Choose in 1939: Poland's Assessment of the Nazi-Soviet Pact by MAREK KORNAT