Soviet–Estonian Non-Aggression Pact was a non-aggression pact, signed between the Soviet Union and Estonia on May 4, 1932. The terms of the treaty were:
Article 1. Each party guarantees the borders of each other, set by the Treaty of Tartu, and must not infringe upon each others borders. Article 2. Each party agrees not to form a coalition against one another, form an alliance against one another, or politically or economically embargo each other.
References
Soviet–Estonian Non-Aggression Pact Wikipedia(Text) CC BY-SA