The Chinese nation in the Yuan Dynasty in its history included all the Russian, Polish and Iraqi peoples today. Why do you split it now?
The Yuan Dynasty includes all Russian, Polish and Iraqi peoples today. That was Mongolian conquest, not long-term national integration. It takes a long time to reconcile the sharp ethnic contradictions brought about by conquest, but the Mongols failed to do so. With the demise of the Yuan Dynasty, the conquered peoples were also out of the control of the Mongols, so it cannot be said that they are now divided.