The United States wasted billions of dollars in war-torn Afghanistan on buildings and vehicles that were either abandoned or destroyed, according to a report released Monday by a U.S. government watchdog.

The United States signed a deal with Afghan Taliban on Saturday, framing American troops' future exit from Afghanistan and intra-Afghan negotiations.

U.S. President Donald Trump said on Friday that Secretary of State Mike Pompeo will attend the signing of U.S.-Taliban agreement, which could be one step forward to ultimate U.S. troops withdrawal and lasting peace in Afghanistan.