 Complete the following phrase:  Led by a Varangian dynasty, the Kievan Rus controlled the routes connecting Northern Europe to Byzantium and to the Orient for example: the Volga trade route. The Kievan state began with the rule 882912 of Prince Oleg, who extended his control from Novgorod southwards along the Dnieper river valley in order to protect trade from Khazar incursions from the east and moved his capital to the more strategic Kiev. Sviatoslav I died 972 achieved the first major expansion of Kievan Rus territorial control, fighting a war of conquest against the Khazar Empire and inflicting a serious blow on Bulgaria. A 