The Pentagon’s inspector general released a report on Thursday that said the United States military had not properly tracked about $1 billion in weapons sent to Ukraine.

The inspector general’s report found that prior to December 2022, the delinquency rate was at about 59% of weapons that required monitoring. That fell by 27 percentage points from February to June 2023 because of better processes. Weapons are delinquent if they have not been inventoried in a certain time.

The report did not determine whether any assistance had been diverted or not, saying it was beyond the scope of the review.

There is a battle brewing in Congress about the future of U.S. military assistance to Ukraine. Congress has approved more than $110 billion for Ukraine since Russia’s invasion.

President Joe Biden has asked Congress to provide another $61 billion in aid to Ukraine, but Republicans are refusing to approve the assistance without an agreement with Democrats to tighten security along the U.S.-Mexico border.