Mongolia and Soviets supported Xinjiang Uyghurs' and Kazakhs' movement in the 1930–1940s. By 1945, the Soviets refused to support them after its alliance with the Communist Party of China and Mongolia interrupted its relations with the separatists under pressure. Xinjiang Oirat's militant groups operated together the Turkic peoples but the Oirats did not have the leading role due to their small population. Basmachis or Turkic and Tajik militants fought to liberate Central Asia (Soviet Central Asia) until 1942.