A non-aggression pact or neutrality pact is a treaty between two or more states/countries that includes a promise by the signatories not to engage in military action against each other. Such treaties may be described by other names, such as a treaty of friendship or non-belligerency, etc. Leeds, Ritter, Mitchell, & Long (2002) distinguish between a non-aggression pact and a neutrality pact. They posit that a non-aggression pact includes the promise not to attack the other pact signatories, whereas a neutrality pact includes a promise to avoid support of any entity that acts against the interests of any of the pact signatories. The most readily recognized example of the aforementioned entity is another country, nation-state, or sovereign organization that represents a negative consequence towards the advantages held by one or more of the signatory parties.
The Molotov–Ribbentrop Pact (German copy)
The Molotov–Ribbentrop Pact, officially the Treaty of Non-Aggression between Germany and the Union of Soviet Socialist Republics, was a non-aggression pact between Nazi Germany and the Soviet Union with a secret protocol that partitioned Central and Eastern Europe between them. The pact was signed in Moscow on 23 August 1939 by German Foreign Minister Joachim von Ribbentrop and Soviet Foreign Minister Vyacheslav Molotov. Unofficially, it has also been referred to as the Hitler–Stalin Pact and the Nazi–Soviet Pact.
Stalin and Ribbentrop shaking hands after the signing of the pact in the Kremlin
The Second Polish Republic, 1937
Molotov (left) and Ribbentrop at the signing of the pact
"The Prussian Tribute in Moscow" in the Polish satirical newspaper Mucha of 8 September 1939