Baikonur, formerly known as Leninsk, is a city in Kazakhstan on the northern bank of the Syr Darya river. It is currently leased and administered by the Russian Federation as an enclave until 2050. It was constructed to service the Baikonur Cosmodrome and was officially renamed Baikonur by Russian president Boris Yeltsin on December 20, 1995. During the Soviet period, it was sometimes referred to as Zvezdograd (Звездоград), Russian for Star City.