[stepanstas]

Kievan Rus is NOT same as "ancient Ukraine".There's no such thing as "ancient Ukraine" or "ancient Russia".Only ancient RUS'. "Knjaz'"(feminin-"khjaginga")-Nordic title,same as germanic "konung"-NOT a KING(QUEEN).The very WORD "Ukraine" was not known untill the Medival Era. In other words,Helga,knjaginja of Kiev,ruler of the Rus',would be really surprised,if someone called her "Olga,wise Queen of Ukraine". That "someone" would,most probably,been executed on the spot,keeping in mind,that Helga was a viking(varjag,in Russ)

ancient - belonging to or originating in the very distant past
Ukraine - a republic in southeastern Europe; formerly a European Soviet; the center of the original Russian state which came into existence in the ninth century