Gauging Xinjiang's ISIS Threat

Xinjiang, in China’s northwest, is vulnerable to ISIS, according to Zhang Chunxian, the populist party chief of the far-flung province, who stated publicly for the first time that Uighurs, a Turkic, mostly Sunni minority group there, have been joining the self-declared Islamic State group.

"Some Xinjiang residents have crossed the border illegally to joi…