In 2014, little more than a year after becoming president, he spent four days in the region, and on the last day of the trip, two Uighur militants staged a suicide bombing outside a train station in Urumqi that injured nearly 80 people, one fatally.
Weeks earlier, militants with knives had gone on a rampage at another railway station, in southwest China, killing 31 people and injuring more than 140. And less than a month after Mr. Xi’s visit, assailants tossed explosives into a vegetable market in Urumqi, wounding 94 people and killing at least 39.
Against this backdrop of bloodshed, Mr. Xi delivered a series of secret speeches setting the hard-line course that culminated in the security offensive now underway in Xinjiang. While state media have alluded to these speeches, none were made public.
The text of four of them, though, were among the leaked documents — and they provide a rare, unfiltered look at the origins of the crackdown and the beliefs of the man who set it in motion.
“The methods that our comrades have at hand are too primitive,” Mr. Xi said in one talk, after inspecting a counterterrorism police squad in Urumqi. “None of these weapons is any answer for their big machete blades, ax heads and cold steel weapons.”
“We must be as harsh as them,” he added, “and show absolutely no mercy.”