Russian is a Slavic language spoken primarily in Russia, Belarus, Ukraine, Kazakhstan, and Kyrgyzstan. It is an unofficial but widely spoken language in Moldova, Latvia, Estonia, and to a lesser extent, the other countries that were once constituent republics of the USSR. Russian belongs to the family of Indo-European languages and is one of three living members of the East Slavic languages. Written examples of Old East Slavonic are attested from the 10th century onwards. Wikipedia