"Negotiators made substantial progress on all four interrelated parts of the peace process: counterterrorism assurances, conditional troop drawdown timelines, moving into intra-Afghan negotiations, and reaching a permanent and comprehensive cease-fire," Mr. Sopko added.
"I don't think it makes sense," Sopko said. "The Afghan people know which districts are controlled by the Taliban. The Taliban obviously know which districts they control. Our military knows it. Everybody in Afghanistan knows it. The only people who don't know what's going on are the people who are paying for all of this, and that's the American taxpayer."