In war-torn Imperial Russia, the liberal February Revolution toppled the monarchy. A period of instability followed, and the Bolsheviks seized power during the October Revolution. The ascendant Bolsheviks soon withdrew from the war with large territorial concessions by the Treaty of Brest-Litovsk and fought their political rivals during the Russian Civil War, including the invading forces from the Allied Powers. In response to Vladimir Lenin, the Bolsheviks and the emerging Soviet Union, anticommunist forces from a broad assortment of ideological factions fought against the Bolsheviks, particularly by the counter-revolutionary White movement and the peasant Green armies, the various nationalist movements in Ukraine after the Russian Revolution and other would-be new states like those in Soviet Transcaucasia and Soviet Central Asia, the anarchist-inspired Third Russian Revolution and the Tambov Rebellion.