In an article. Khalilzad wrote Pakistan had consistently played a double game, providing just enough sporadic assistance in capturing members of Al Qaeda.
At the same time, he alleged, Pakistan had been harboring, training, and assisting violent extremist groups such as the Taliban .
"Islamabad's duplicitous policy has been the single most important factor preventing success in Afghanistan," the Afghanistan-born diplomay said.
In his write-up published in the National Interest, Khalilzad . . .
