Relations between Yarkand Khanate and Ming Dynasty China were not developed, although the far eastern boundaries of Yarkand reached the Jiayuguan Pass at the western end of the Great Wall of China due to holy expeditions of Mansur Khan, including expeditions against the "Sarigh Uyghurs" — Yellow Uyghurs or Uyghurs of yellow religion, called Yugurs, who worshipped Tibetan Buddhism and took refuge in Gansu province of Ming China in 1529, fleeing the holy warriors of Mansur Khan. This situation can be partly explained by the full extinction of Silk Road trade by this time.