Why Western Europe and Russia developed differently?

Russia grew in the shadow of the Byzantine Empire, which itself was the eastern half of the Roman Empire. Generally speaking, the eastern half of the empire owed a stronger cultural debt to the Hellenistic Age, being as it extended across the territories which had earlier been conquered by Alexander the Great, and controlled by the successor states that emerged from the collapse of his empire. The Eastern Empire's common language, for example, remained Greek.

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