There was no Kievan Rus. Kievan Rus is the term created by historians in the 19th century. There was Rus state that included territories of Belarus, north-western Russia and 2/3 of present day Ukraine minus southern-eastern and southern territories of present day Ukraine . I was writing about Ukraine within its current borders. Moreover, Rus was a loose state with 2 or 3 competing centres Kiev, Novgorod (Russia) , and possibly Polotsk (Belarus) The state existed between Oleg rule and Yaroslav the Wise rule - a relatively short period of time. Approximately between 890AD-1054AD. So read about history of Ukraine and you may know something.