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In page Second East Turkestan Republic:

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The Soviet Union set up similar puppet-states in Pahlavi-dynasty Iran in the form of the Azerbaijan People's Government and Republic of Mahabad.[1] The Soviet Union used comparable methods and tactics in both Xinjiang and Iran upon establishing the Kurdish Republic of Mahabad and Autonomous Republic of Azerbaijan.[2] The American ambassador to the Soviet Union sent a telegram to Washington DC noting the similarity of the situations in Iranian Azerbaijan and in Xinjiang.[3]