I d like to express my opinion. don't believe in Nordic theory. It was written in 18th century by 3 german guys, who had only one target - to weaken russian influence, at that time there was no any written Russian history, so that was a good idea to put down Russia in such way. And i doubt that it is possible to write smth authentic being in germany. Great russian scientist Lomonosov said that they had killed all russianness in their work and made russians the poorest people ever without their oun culture.
and one more thing....
Rurik wasn't from Scandinavia, he was Baltic slav, half slavic, half baltic, and as we know baltic languages look slavic(some scientists combine slavic and baltic languages in one language groupe), so we can consider him almost slavic person.