Key facts: The DOD is supposed to use special "enhanced end-use monitoring" techniques" to "safeguard" key weapons such as smaller, high-tech weaponry provided to Ukraine, which are likely targets for theft.

The audit says these monitoring procedures are not properly being followed in Ukraine, due to staffing shortages, poor internal logistics and more.

The audit found that $1 billion of the $1.7 billion — or 59% — in enhanced end-use monitoring designated weapons provided to Ukraine as of June 2023 are "delinquent," meaning they can't be accounted for in inventory reports.

Maybe the weapons are being used properly; maybe they have been stolen by Russian forces. No one can be completely sure.

The 59% delinquency rate is an improvement over the 86% of weapons that were unaccounted for in December 2022.

The weapons include night-vision devices, anti-tank missiles, attack drones and small-diameter bombs.

The report also found that inventory databases were not regularly updated and that the Ukrainian Armed Forces failed to properly report missing weapons.

Officials have stressed that the weapons may in fact be completely fine. Just because the DOD failed to keep track of the weaponry does not necessarily mean it was stolen.

The Army, Air Force and more agreed that procedures would be fully updated by September 2024.

Background: The Biden administration has sent over $75 billion to Ukraine since February 2022, including $44 billion in military aid.