In August 1939.
Germany
The Molotov-Ribbentrop Pact was signed 23 August 1939.
The Soviet Union (Which is now Russia).
Joseph Stalin and the Soviet Union.
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.
germany and soviet union
The Nazi-Soviet Pact 1939
The Soviet Union had originally signed a non-aggression pact with Germany, but Hitler broke the pact and invaded the Soviet Union.
non-agression
Non agression Pact
The Soviet Union