On 9 February 1929, at Moscow, Estonia, Latvia, Poland, Romania and the Union of Soviet Socialist Republics signed the Protocol for the Immediate Entry into Force of the Treaty of Paris of 27 August 1928 regarding Renunciation of War as an Instrument of National Policy — the Litvinov Protocol. A single original; authentic copies to be communicated by the Government of the USSR. Plenipotentiaries: Julius Seljamaa; Charles Ozols; Stanislaw Patek; Charles A. Davila, Romanian minister at Warsaw; Maxim Litvinov, acting People's Commissar for Foreign Affairs. The Kellogg-Briand Pact, signed at Paris, is a distinct instrument; this Protocol brings it into force among the parties without waiting for Article III of that Pact.

Article I: the Treaty of Paris, annexed as an integral part, enters into force between the Contracting Parties after ratification of that Treaty by their competent legislative organs. Article II: that entry into force under this Protocol is valid independently of the general entry into force of the Treaty of Paris as stipulated in Article III thereof.

Article III: the Protocol shall be ratified; instruments are deposited with the Government of the USSR within one week of ratification. It enters into force between two Parties on the day the second deposits; for the others, as they deposit. The USSR immediately notifies each deposit. Wikipedia: Latvia 5 March, Estonia 16 March, Poland and Romania 30 March 1929; registered in the League of Nations Treaty Series, volume 89, on 3 June 1929.

Article IV: after ratifying the Treaty of Paris, each Party notifies the USSR and the other Parties by the diplomatic channel. Article V: open to accession by the governments of all countries, by notification to the USSR; upon receipt, the Protocol is in force between the acceding State and the other Parties. Article VI: for acceding States, bringing the Treaty of Paris into force follows Article IV. Lithuania, Finland, Turkey and Persia acceded later; they were not signatories on the day of signature.

Article VII: a single copy. This is not a disarmament treaty: Litvinov presented it as a regional acceleration of the Paris Pact, from whose 1928 signing the USSR had been kept apart, though it acceded. Wikipedia infoboxes that treat it as a free-standing peace treaty, separate from Kellogg-Briand, are imprecise: it is a protocol of entry into force.

The Treaty of Paris later entered into force generally; this Protocol does not copy the Paris formula. Poland's Dziennik Ustaw published the Protocol after the ratification statute of 23 March 1929.

Cover: Moscow in the 1920s, the city of signature — not the signing room. Wikimedia Commons, free licence.

For context: Litvinov Protocol. The text: Protocole pour la mise en vigueur du Traite de Paris.