Soviet–Finnish Non-Aggression Pact
The Soviet–Finnish Non-Aggression Pact was a non-aggression pact that was signed in 1932 by representatives of the Soviet Union and Finland and updated on 7 April 1934. The pact was unilaterally renounced by the Soviet Union in 1939 after it had shelled one of its villages and blamed Finland in a false-flag attack.
Source: Wikipedia — Soviet–Finnish Non-Aggression Pact (CC BY-SA 4.0)