Russian is an East Slavic language belonging to the Balto-Slavic branch of the Indo-European language family. It is one of the four extant East Slavic languages, and is the native language of the Russian people. Russian was the de facto official language of the former Soviet Union. It has remained an official language of Russia, Belarus, Kazakhstan, and Kyrgyzstan, has constitutional status as the language of inter-ethnic communication in Tajikistan, and is still used as a lingua franca in Ukraine, Moldova, the Caucasus, Central Asia, and to a lesser extent in the Baltic states and Israel.