Allied intervention in the Russian Civil War Powers to withdraw from North Russia and Siberia in 1920, though Japanese forces occupied parts of Siberia until 1922 and the northern half of Sakhalin until 1925. In 1917, Russia was in a state of political strife, and public support for World War I and the Tsar was dwindling. The country was on the brink of revolution. The February Revolution changed the course of the war; under intense political pressure, the Tsar abdicated and the Russian Provisional Government was formed, led initially by Georgy Lvov and later by Alexander Kerensky. The Provisional Government pledged to continue fighting the Germans on
Polish National Committee (1917–19) proposing the creation of a Kingdom of Poland which was meant as a puppet state of the German Empire under control of the Central Powers. This act is known as the Act of 5th November. After its proclamation, different Polish political groups and organizations began to seek the support of Entente states in the hope rebuilding the Polish state. In August of the following year the Polish National Committee was established and continued its activities until 1919. Polish National Committee (1917–19) Polish National Committee () was formed in Lausanne on 15 August 1917 by Polish National Democracy politician Roman Dmowski.