Russian Empire
Though the Empire was only officially proclaimed by Tsar Peter I following the Treaty of Nystad (1721), some historians would argue that it was truly born either when Ivan III of Russia conquered Veliky Novgorod in 1478, or when Ivan the Terrible conquered the Khanate of Kazan in 1552. According to another point of view, the term "Tsardom", which was used after the coronation of Ivan IV in 1547, was already a contemporary Russian word for empire.
Russian Soviet Federative Socialist Republic
Under the leadership of Vladimir Lenin (1870–1924) and Leon Trotsky (1879–1940), the Bolshevik communists established the Soviet state on , immediately after the interim Russian Provisional Government, most recently led by opposing democratic socialist Alexander Kerensky (1881–1970), which governed the new Russian Republic after the overthrow of the Russian Empire government of the Romanov imperial dynasty of Czar Nicholas II the previous March, was now itself overthrown during the following October Revolution, the second of the two Russian Revolutions that turbulent year of 1917 during World War I. Initially, the state did not have an official name and wasn't recognized by neighboring countries for five months. Meanwhile, anti-Bolsheviks coined the mocking label Sovdepia for the nascent state of the Soviets of Workers' and Peasants' Deputies.