Yeah I had never been talk that in school. Recently kasporov pointed it out in a pod cast I was listening too. It's so obvious but I'd never thought of it that way because of the narrative that we are taught.

Just out of curiosity, where are you from?

Here in Poland this is very well known fact and nobody is going to forget this, for a very long time.

Soviets attacked Poland on September 17th, 1939 in accordance with plans they made with Nazis before the war. They made plans which part of Poland belonged to Soviets and which to Nazis and then were all too happy to occupy until Nazis turned on them.

UK, northern Ireland.