On 28 September 1926, in Moscow, the Soviet Union and Lithuania sign the Non-Aggression Pact — the treaty confirming the Peace Treaty of 12 July 1920 and committing mutual respect for sovereignty and territorial integrity.

Each party undertakes to refrain from aggression and not to support third parties attacking the other; and not to join alliances or boycotts directed against the other. The USSR continued to recognise Vilnius as Lithuanian, though it was under Polish control. Exchange of ratifications: Kaunas, 9 November 1926; registered in LNTS vol. 60.

The pact sparked protests in Lithuania and was cited among causes of the December 1926 coup. It was extended in 1931 and 1934; broken by the Soviet occupation of 15 June 1940.

Signatories: Chicherin, Alexandrovsky, Sleževičius and Baltrušaitis.

For interwar Baltic diplomacy, 28 September 1926 marks the Moscow signature.

The text is available on FOROST / LNTS.

The Soviet–Lithuanian Non-Aggression Pact of 28 September 1926 remains the Kaunas–Moscow relations milestone.

Image: Moscow / Lithuania; Wikimedia Commons. Cropped to 16:9.

Source consulted: Soviet–Lithuanian Non-Aggression Pact. Treaty text: FOROST — Soviet–Lithuanian Non-Aggression Pact.