What was the relationship of Germany and the USSR leading up to the World War 2?

Hitler, fearing another two front war as in World War 1 conducted the Non-Agression Pact. This pact made both Germany and Russia neutral between one another and they both shared the lands of occupied Poland. This concealed the true incentive of Hitler, who used the pact to enshroud his conquest of Russia and give the country's occupants a false sense of security. Alligning with Slavs, mere "subhumans" was out of the question in real terms. Afterwards, he broke the pact and attacked Russia in Operation Barbarossa which literally meant defeat for Germany and it's "Aryan" people.