The History Place
The History Place: The Triumph of Hitler: The Nazi Soviet Pact
Describes the alliances that were forming between countries in the lead-up to the outbreak of World War II, the negotiations between Hitler and Mussolini, and the Nazi-Soviet Non-Aggression Pact signed by Germany and Russia.
Internet History Sourcebooks Project
Fordham University: Modern History Sourcebook: The Molotov Ribbentrop Pact
This site from the Modern History Sourcebook which is provided for by Fordham University contains the text of the Molotov-Ribbentrop Pact, the Nazi-Soviet Non-Aggression Pact.