From the prior inhabitants through the ancient and acceptable right of force-of-arms...
The Russian state first started with a small group of Viking princes in the area of Kiev and expanded to rule an area that used to be home to a wide variety of empires, states, kingdoms, and tribes.
The Russian state first started with a small group of Viking princes in the area of Kiev and expanded to rule an area that used to be home to a wide variety of empires, states, kingdoms, and tribes.
http://en.wikipedia.org/wiki/History_of_russia#Kievan_Rus.27