Why didn't the Allies declare war on the USSR when they invaded Poland?

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♦Music Used :
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♦Sources :

The Popular Front and Central Europe: The Dilemmas of French Impotence 1918-1940
By Nicole Jordan
Prazmowska, Anita J. (2004). Britain, Poland and the Eastern Front, 1939. Cambridge Russian, Soviet and Post-Soviet Studies Soviet and East European Studies. Volume 53. Cambridge University Press. p. 203. ISBN 9780521529389.

Keith Sword. British Reactions to the Soviet Occupation of Eastern Poland in September 1939. The Slavonic and East European Review, Vol. 69, No. 1 (Jan., 1991), pp. 81-101.

Prazmowska, Anita J. (2004). Britain, Poland and the Eastern Front, 1939. Cambridge Russian, Soviet and Post-Soviet Studies Soviet and East European Studies. Volume 53. Cambridge University Press. p. 203. ISBN 9780521529389.

https://www.historyextra.com/period/second-world-war/why-did-britain-and-france-not-declare-war-on-the-soviet-union-when-the-red-army-marched-on-poland-in-september-1939/

https://en.wikipedia.org/wiki/Edward_Wood,_1st_Earl_of_Halifax#/media/File:1st_Earl_of_Halifax_1947.jpg
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Видео Why didn't the Allies declare war on the USSR when they invaded Poland? канала Knowledgia