What role did the Vikings play in the emergence of the two states of the centers of the Eastern Slavs?

What role did the Vikings play in the emergence of the two states of the centers of the Eastern Slavs? Can we consider that they were the creators of the Old Russian state?

With the arrival of the Varangians in Russia, two political centers, Kiev and Novgorod, emerged. So Novgorod became the center of the northern lands of the Slavs, and Kiev of the southern ones. After Oleg came to power in 882, he was able to unite these lands and create a single state – Kievan Rus. From this time the history of the great dukes begins.