July 1939 The UK and France declare that they will aid Poland if it is attacked.
In September 1939, both the Soviet Union and Germany invade, and the country is divided in half
France and UK declare war on Germany, but not on the Soviet Union.
Why is that?
“France and UK declare war on Germany, but not on the Soviet Union. Why is that?”
Probably because that’s what the map dictates. They shared a border with Germany and it was an actual threat to their own survival. A prime concern of militaries is logistics. There would have been no way for England and France to project power against the USSR. As it was they couldn’t even hold Germany at bay.
Neville Chamberlain? Churchill didn't take office until May of 1940. The non-aggression pact between Germany and Russia basically ended on June 22, 1941, when the Nazis invaded Russia. I don't know if Churchill has ever explained why England didn't declare war on Russia at the same time they did Germany. Perhaps it was because they were hoping to get the U.S. involved in the war in Europe before doing so. Maybe someone with more info knows the answer to it. This is just my own thoughts.
Because the USSR was on the side of allies during WW2.