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Eastern Slavic linguistics does not yet have an introductory course to the history of Eastern Slavic languages. Such introductory courses as: "A. Shakhmatov's Introduction to the History of the Russian Language and N. Durnovo's Introduction to the History of the Russian Language can be considered methodologically outdated, and they do not cover all East Slavic languages, but only Russian. Meanwhile, researchers face a number of problems that need to be investigated before starting the history of these languages - Ukrainian, Russian, and Belarusian.