So, on September 1, 1939, Germany invaded Poland. Both Britain and France tell Germany to stop or else, which Germany does not do, so Britain and France declare war on Germany on September 3.
On September 17, the USSR invades Poland.
Britain and France did not declare war on the USSR.
Why not? Did they figure that Poland was already doomed (The Germans had encircled Warsaw the day before) and that there was no point in declaring war on the USSR? Had they actually paid attention to Hitler's rantings about 'Jewish Bolshevism' and figured the USSR would be next on his hit list? Did they figure that there was no point to declaring war on the USSR because there was no way for them to get at the Soviets?
Why?
On September 17, the USSR invades Poland.
Britain and France did not declare war on the USSR.
Why not? Did they figure that Poland was already doomed (The Germans had encircled Warsaw the day before) and that there was no point in declaring war on the USSR? Had they actually paid attention to Hitler's rantings about 'Jewish Bolshevism' and figured the USSR would be next on his hit list? Did they figure that there was no point to declaring war on the USSR because there was no way for them to get at the Soviets?
Why?