It would have been highly unusual for the Ukrainian military to have depleted their entire anti-air arsenal in April, given that, at the time, they weren't rece

It would have been highly unusual for the Ukrainian military to have depleted their entire anti-air arsenal in April, given that, at the time, they weren't receiving Western high-altitude anti-air systems. (Nor were they facing a persistent campaign by Russian warplanes deep behind the front line, since by that point the Russian air force had largely given up on straying deep into Ukraine.)