Are you really that dense?
NATO were not in any sort of mode to supply Ukraine with any weapon. Now, why that is your guess as best as mine. But just look back at what NATO give to Ukraine, that does not even mean 1% of the entire NATO reserve stock. Unless you call a few HIMARS, Pzh2000, MLRS, M777, a few Poland and Slovikia T-72 and the 28 upgraded M55 and several hundred thousand of assorted portable anti tank weapon are "Significant", and then even those weapon can stop an Russian invasion and make counter offensive.....That's how stupid Russian military were.
Where are the 450 M1 Abrams that the Marine just gave up? Where are the 142 M1128 Mobile Guns Platform the Army just retired this year? How about the M270 the Marine replaced with HIMARS? That's just American, there are alot of goodies like the Leopard 1 Tank from Canada, L2A4 tank from Netherland and Germany in storage, T-72 Poland had in storage? Yeah, Poland send some 100 but they had at least 10 times that.
And it wouldn't take a dumbass to figure out you need to send your stock ammo first, are you really expecting US to increase Ammo making capacity and send those newly make shell to Ukraine, sure, come back in a month time and collect your ammo?? LOL Are you for real?
It also would take a dumbass to figure out NATO does not produce 122 shell or 152 shell that Pakistan and Iran send respectively, those are ex-soviet Ammo, NATO don't produce them AT ALL, even China don't produce them, there aren't a lot of country producing them, majority of those are from Russia, I am sure Ukrainian should ask Russian for ammo for its Soviet Era weapon.
Jesus, just exactly how stupid were you? Most of the stuff you ask it wouldn't take 2 seconds to process to figure out. And yet you still ask them anyway....