This is correct.  The Arabic traveller Ibn Fadlan's account of a Viking funeral, which was borrowed almost word-for-word by Michael Crichton for his novel "Eaters of the Dead" (made into the movie "The 13th Warrior"), was a Rus funeral.  According to a Nova documentary I have, they settled what would later become one of the major Russian cities (Kiev?) and travelled along the Dnieper (sp?) river.  The details are a little fuzzy for me, because I haven't watched the documentary recently.

 

Jamie