https://en.wikipedia.org/wiki/Mongolian_People%27s_Republic
"However, the Republic of China was able to use the Russian Revolution and the ensuing civil war as a pretext to deploy troops in Outer Mongolia, and in 1919 the Mongolian government was forced to sign a treaty that abolished Mongolia's autonomy."
"After the war, international ties were expanded and Mongolia established relations with North Korea and the new Communist states in Eastern Europe. Mongolia and the People's Republic of China (PRC) recognized each other in 1949, and the PRC relinquished all claims to Outer Mongolia. However, Mao Zedong privately hoped for Mongolia's reintegration with China."
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