The fact that the slavic people and the Vikings were very close to each other, to the point where it was common for Slav (mostly from Poland) and Viking ruling

The fact that the slavic people and the Vikings were very close to each other, to the point where it was common for Slav (mostly from Poland) and Viking ruling families to inter-marry, is well established [1]. The Vikings went quite farther than Kyiv, as the existence of the Varangian Guard [2] (part of the Byzantine army) attests to (Varangians was the name the Vikings were known by in the Bizantine Empire). And as we know, they also reached the Canadian coast [3], so it's not the least surprising to me that their trade extended from Greenland to at least, Kyiv. [1] https://en.wikipedia.org/wiki/Vikings#Intermixing_with_the_Slavs https://en.wikipedia.org/wiki/Vikings#Intermixing_with_the_S... [2] https://en.wikipedia.org/wiki/Varangians#Varangian_Guard https://en.wikipedia.org/wiki/Varangians#Varangian_Guard [3] https://en.wikipedia.org/wiki/L%27Anse_aux_Meadows https://en.wikipedia.org/wiki/L%27Anse_aux_Meadows