Xu Shuzheng
In 1919, taking advantage of the weakness of Russia's government caused by revolutions and civil war, the Chinese government, established by members of the Anhui military party, sent troops, led by General Xu Shuzheng, to join Outer Mongolia to China and end its autonomy, which violated the terms of a tripartite Russian-Mongolian-Chinese agreement concluded in 1915 that secured the autonomy of Outer Mongolia and did not allow the presence of Chinese troops except for small numbers of consular guards. Although the Anhui party was supported by Japan, indications of Japan-inspired Chinese occupation of Outer Mongolia have not yet been confirmed by documents.