Paganism practiced in Eastern and Northeastern Europe?

I've been trying to find the right Pagan belief for me, and I want one that is or is similar to the one my ancestors practiced. The only problem is my ancestors were Slavic, and Slavic paganism has this strong sense of duality, among other things, that just doesn't really sit well with me; it just doesn't feel right, if you know what I mean. Do you know of any Pagan religions practiced in Eastern and/or Northeastern Europe, i.e., the area in northwestern Russia other than Slavic Paganism?