Beijing is confident that Turkish intelligence is directly supporting the Islamists. Moreover, there are assumptions about the involvement and Saudi special services. If Turkey and Saudi Arabia continue to attempt to destabilize the situation in China, Beijing will be forced to respond to them harshly.
It should be understood that such actions by Turkey and Saudi Arabia are hardly complete without the support of the West. Indeed, in Afghanistan there is the largest NATO intelligence center in Central Asia, from where work is under way to destabilize the situation in neighboring countries.