https://www.moonofalabama.org/2022/08/ukraine-a-frontline-report-vanishing-foreign-weapons.html
Some people ask why I read the New York Times and other such outlets of mostly 'western' propaganda. One obvious reason is to "know your enemy", to find out what the propaganda wants us to think.
All those thousands of Stingers, Javelins and other man-portable weapons are of huge interest to various nefarious actors. The weapons that vanish in Ukraine to go somewhere will most likely reach places where they can and will be used against 'western' forces or interests.
Those who support the weapon transfers will say that the loss of some share of them does not matter in the big picture. Tell that to those who will die from them.