Kievan Rus (862-1242) was a medieval political federation located in modern-day Belarus, Ukraine, and part of Russia (the latter named for the Rus, a Scandinavian people). The name Kievan Rus is a modern-day (19th century) designation but has the same meaning as 'land of the Rus,' which is how the region was known in the Middle Ages.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Kievan_Rus/.