The document discusses the geopolitical situation in Europe in the late 1930s and early 1940s. It notes that Stalin and the USSR were seen as villains like Hitler at the time. It then outlines that the USSR invaded and took control of several countries, including signing a non-aggression pact with Nazi Germany. However, everything changed in 1941 when Germany invaded the USSR, marking the decisive stage of World War 2 in which the USSR defeated Germany, but at tremendous cost.