Shortfalls in monitoring by American officials mean the U.S. cannot account for more than $1 billion in weapons and military equipment provided to Ukraine to fight invading Russian forces.
We didn't give it directly to Ukraine, which is why this is happening.
A bunch of countries were donating equipment through the same few routes thru the same countries.
Even if it was cataloged and documented properly, it takes time to go all thru the chain all the way to the end and hear back. Especially since all the countries are probably asking.