Key Historical Events. The country passed under Russian control in 1881. The Turkmen Soviet Socialist Republic was formed on 27 Oct. 1924 and covers the territory of the former Trans-Caspian Region of Turkestan, the Charjiui vilayet of Bokhara and a part of Khiva situated on the right bank of the Oxus. In May 1925 the Turkmen Republic entered the Soviet Union as one of its constituent republics. In Aug. 1990 the Turkmen Supreme Soviet unanimously adopted a declaration of sovereignty.
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