Afghanistan's president has approved the release of a final batch of 400 Taliban prisoners. It's part of a prisoner exchange agreed under a deal in February between the Taliban and the U.S. And it's expected to clear the way for long-awaited peace talks in Qatar and a cease-fire. The process will bring the United States closer to withdrawing its troops and ending its longest military engagement. The Taliban, who ruled Afghanistan from 1996 until 2001, previously refused to talk to the Afghan government, dismissing it as a U.S. puppet.