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
The Revolution Betrayed sensational public announcement of the first of three great public Moscow Trials generated by the secret police terror known to history as the "Great Purge" ("Ezhovshchina"")". When Trotsky became aware of the trial, which would ultimately end in the execution of Grigory Zinoviev, Lev Kamenev, and other prominent Soviet political figures, a short postscript was tagged on to his introduction in which Trotsky claimed that his current book constituted "advance exposure" of the Stalin regime's effort at "deliberate mystification." "The Revolution Betrayed" has been characterized by historian Baruch Knei-Paz as Trotsky's "major work on Stalinism" and constituted the chief primary