The return of Xinjiang to Chinese central control during the late period of the Sino–Japanese War: a reappraisal based on Chiang Kai-shek's Diary

After the outbreak of the Pacific War, while considering taking back the Japanese-occupied areas, the Nationalist government also started to think of recovering the frontier regions, which had been somewhat out of China's control under the influence of a major ally of China, the USSR. For a long time, Xinjiang had a very close relationship with the Soviet Union under the rule of Sheng Shicai, and the central government of China had little direct control. In April of 1942, Sheng Shicai, suspicious of a Soviet conspiracy to overthrow his rule, conducted mass arrests in Xinjiang, causing a sudden deterioration in the relationship between Xinjiang and the Soviets. At first, the Soviet Union attempted to intimidate Sheng in order to prevent him from turning to the central government, but failed. Paying no heed to the alienation policy of the Soviets, the Nationalist government soon decided to buttress Sheng in an effort to place Xinjiang under centralized control. The Nationalist government first set out to take back the diplomacy of Xinjiang, followed by expropriation of formerly Soviet-controlled enterprises and forced removal of Soviet military advisors, experts, technicians and army personnel from Xinjiang. In the meantime, a large number of party, government, economic, cultural and educational personnel were dispatched by the central government to Xinjiang to infiltrate various sectors. With the weakening of his own power and increasing conflicts with the central government, Sheng Shicai planned another turn of events. By executing a new round-up, this time to cleanse Xinjiang of the central government's forces, Sheng re-oriented his regime towards the Soviet Union. Yet his gesture was turned down by the USSR because of his loss of credibility. Well prepared militarily, the Nationalist government eventually forced Sheng Shicai to leave Xinjiang, which then was almost fully restored to the authority of the central government.