Baikonur (Kazakh: Байқоңыр, Bayqoñır; Russian: Байконур, Baykonur), formerly known as Leninsk (also, see Tyuratam), is a city of republic significance in Kazakhstan on the right bank of the Syr Darya river, rented and administered by the Russian Federation. It was constructed to service the Baikonur Cosmodrome and was officially renamed Baikonur by Russian president Boris Yeltsin on December 20, 1995.