Russian: An East Slavic Language of the Cyrillic World

Russian belongs to the East Slavic branch of the Indo-European family, closely related to Ukrainian and Belarusian, all three descended from the Old East Slavic spoken across medieval Kievan Rus before regional divergence accelerated following the Mongol invasions and later differing political trajectories under Muscovite, Lithuanian-Polish and other rule.

Russian is written in the Cyrillic script, itself developed in the ninth and tenth centuries by disciples of the Byzantine missionaries Cyril and Methodius specifically to render Slavic languages for Orthodox Christian liturgical and scriptural use, giving Russian an alphabet whose origin is directly religious rather than a later secular adaptation. Russian became the dominant literary and administrative Slavic language following Moscow's rise and the Russian Empire's expansion, absorbing vocabulary from Church Slavonic, French, and later German and English, and Soviet-era language policy spread Russian as a lingua franca across the multiethnic Soviet Union, leaving it a widely understood second language across much of the former Soviet space even after the 1991 collapse. Russian's own dialectal variation is comparatively modest next to some other major European languages, a relative uniformity linguists attribute partly to centuries of centralized Muscovite and later Soviet administration standardizing education and broadcasting across an enormous territory.