It’s actually a fairly easy explanation. You have ONE tin-pot despot who wants some toys, for gawd-know-whatever-reason, and immediately all the neighboring countries feel that have to get some also..
They all watched “Black Hawk Down” and wanted to get in on the action, this time with modern battle gear.
They are not planning to do anything with them.
They’re just shiney and look nice.
Heaven knows, they have no way of maintaining them.