Iraq’s Shiite-led government has begun training Sunni tribal fighters here in the western province of Anbar, in an urgent U.S.-backed initiative to stem recent advances by Islamic State. The setbacks in Anbar have exposed the need for trusted and equipped Sunni fighters to help turn momentum against Islamic State and dry up the extremists’ pool of potential recruits. “When the government fails, people turn to Islamic State,” said Mohammad Abu Risha, a young tribal sheik from Anbar who commands 150 fighters. “The tribes don’t trust the government, and the government doesn’t trust the tribes.” Mr. Abu Risha, speaking at an inaugural ceremony for the Anbar training program in Amriyat […]