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 Empire
Newly discovered Arctic islands became part of the Russian Empire as Russian explorers found them: the New Siberian Islands from the early 18th century; Severnaya Zemlya ("Emperor Nicholas II Land") first mapped and claimed as late as 1913.