>>11929577>>11933334>>11933349Mongols did not even have enough Mongols willing to move into China and garrison it.
mongols relied on non-Mongol offiers and soldires for the majority of their military garrisons in non-Mongol regions. They shifted different ethnic soldiers to each other's countries
Han Chinese generals and soldiers were shifted west by the Mongol empire to be stationed in Central Asia in Uyghur lands in Xinjiang, in Bukhara and Samarqand in Uzbekistan and Baghdad in Iraq, while Central Asian Muslim generals and soldiers were in turn shifted east to be stationed in China and Korea, so that the soldiers in each area would not conspire with he local populations against Mongols.
Mongols forced Korea to provide hundreds of thousands of virgin Korean girls and Korean boy eunuchs, and distrubited the Korean girls as gifts to their Central Asian Muslim and Han Chinese soldiers.
https://archived.moe/qa/thread/4601866/#q4601866https://archived.moe/qa/thread/4609970/#q4609988The bulk of Mongols stayed as nomads in Mongolia and did not move into Han provinces. That's why the last Yuan emperor fled to the steppes of Mongolia and continued reigning in Mongolia as the northern Yuan dynasty. The Mongols never integrated into the Han population.
today in China, the descendants of those Miongol empire and Yuan Central Asian garrisons an d Korean women are the Hui Muslims. Despite speaking Chinese now and practicing similar culture now, they still identify as an entirely separate ethnicty from Han because of their paternal lineage, they trace their ancestry to Central Asian Muslims and identify as Hui, not as Korean or Han. There are 8.61 million Hui in China. The Salars are also descendants of Central Asian Muslim garrison under Mongol empire in China except their ancestors married Tibetan women so their culture is tinged with Tibetan but they never identify as Tibetan because of their paternal lineage.
https://archived.moe/his/thread/11852821/#q11852821 
