It seems that Americans are not very interested in a settlement of the situation in Afghanistan, in particular, on the border with Xinjiang Uyghur Autonomous Region, as confirmed by this document.
Washington uses Uyghur factor to put pressure on China, and so it is ready to cooperate closely with Uyghur militants and militia leaders, i.e. the terrorists, allowing them to move and act freely around the territory of Afghanistan. Americans do not fight against them in the same manner as it takes place in Syria towards terrorists of Jabhat al-Nusra, among which there are a large number of representatives of the Uyghurs.
It is likely that in the case of progress in the negotiations between Americans and representatives of Uyghur terrorists groups, China will be swept up in a wave of violence and terrorist attacks, which will be, directly or indirectly, supported and sponsored by the United States.