Joseph Stalin and Benito Mussolini
The Soviet Union (Which is now Russia).
Germany
The Molotov-Ribbentrop Pact was signed 23 August 1939.
Joseph Stalin and the Soviet Union.
In August 1939.
Nazi-Soviet nonagression pact.
There has probably been more than one non-aggression pact in history but the most famous is the 1939 pact between Nazi Germany and the Soviet Union - which Germany broke in 1940.
The Soviet Union signed a non-agression pact to buy time before the Germans attacked them. The pact also included secret clauses, one of which planned the division of Poland.
Soviet foreign minister Maxim Litvinov was replaced by Vyacheslav Molotov in 1939. Molotov negotiated the German-Russian Nonagression pact in August of 1939.
In 1934 - five years before the start of the World War 2 - Germany and Poland signed a non-agression pact. I wonder if that is what you have in mind.
Joseph Stalin