I'm not going to deny the fact Russia (or the Russian principalties) knew an important cultural and economical growth during that era, but this was achieved only because Russia became part of the Byzantine cultural and political area, and became the crossroad of trade between northern/eastern Europe and the levant.
But then, according to these standards, it could be argued that the Khazar Khaganate, for example was also more advanced than Europe (for pretty much the same reasons).
Then, in any case, the idea that Europe was a backward place in the 9th century is just as wrong as the view that Russia never brought anything to culture. The Carolingian Empire had a pretty efficient administration. Trade was flourishing, despite the increasing viking threat, and the empire was pretty tolerant (jewish communities were growing, muslims traded in southern France, Avars and Bulgars moved to the eastern fringes of the empire, etc.)
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