Except Rurik the viking (or Varangian, as the Slavs called him) was almost certainly a swede, not finnish descent. You should read the history and stop propagating false info.
He fought the finnish-ugric tribes and the slavs of the region (NW of Present day Russia) and was
defeated by these tribes (hardly makes him the toughest viking
)
Later the slavs and the finnish-ugric tribes started fighting among themselves and Rurik (along with his brothers) were
invited back by these tribes to establish peace and order. And thus began the Rurikid dynasty.
Later the Finnish-ugric tribes and the varangian (i.e. viking) family of swedish stock were both assimilated into Slavic culture.
Maybe that's why the German term Finlandization came into being.
Finlandization - Wikipedia, the free encyclopedia