On 25 July 1932, the Soviet Union and Poland sign the Soviet–Polish Non-Aggression Pact — the instrument committing both states not to resort to force against each other.

Negotiated amid Poland’s isolation and Soviet bilateral-pact policy, it was later extended and remained in force until the Soviet invasion of 17 September 1939.

It complements Poland’s efforts to balance relations with Germany and the USSR in interwar Central Europe.

The 1939 breach, after the Molotov–Ribbentrop Pact, showed the fragility of 1930s non-aggression guarantees.

For East European diplomacy, 25 July 1932 marks the signing of the Soviet–Polish non-aggression pact.

The text is documented in treaty collections and diplomatic archives.

The Soviet–Polish Non-Aggression Pact of 25 July 1932 remains the milestone of bilateral relations before 1939.

Image: Poland / USSR; Wikimedia Commons. Cropped to 16:9.

Source consulted: Soviet-Polish Non-Aggression Pact. Treaty text: Soviet-Polish Non-Aggression Pact (LNTS).