 Complete the following phrase:  The establishment of the first East Slavic states in the 9th century coincided with the arrival of Varangians, the Vikings who ventured along the waterways extending from the eastern Baltic to the Black and Caspian Seas. According to the Primary Chronicle, a Varangian from the Rus people, named Rurik, was elected ruler of Novgorod in 862. In 882, his successor Oleg ventured south and conquered Kiev, which had been previously paying tribute to the Khazars. Ruriks son Igor and Igors son Sviatoslav subsequently subdued all local East Slavic tribes to Kievan rule, destroyed the Khazar Khaganate, and launched several military expeditions to Byzantium and 