Russian Empire
The Russian Empire, also known as Imperial Russia or simply Russia, was an empire that existed across Eurasia and North America from 1721, following the end of the Great Northern War, until the Republic was proclaimed by the Provisional Government that took power after the February Revolution of 1917.
Russian Republic
The Russian Republic () was a short-lived state which controlled, "de jure", the territory of the former Russian Empire after its proclamation by the Russian Provisional Government on 1 September (14 September, ) 1917 in a decree signed by Alexander Kerensky as Minister-President and Alexander Zarudny as Minister of Justice.