These are excellent questions: indeed, they might prove to be of fundamental importance (as for…

Precisely that is why the quantity of available ammo is always kept top secret: it's something one can't find anywhere.

These are excellent questions: indeed, they might prove to be of fundamental importance (as for why: well, if out of ammo, nobody can fight there).

Precisely that is why the quantity of available ammo is always kept top secret: it's something one can't find anywhere.

....which is why then it's so hard to assess their effects, too.

Now, early during the war, the Russians have hit (and blown up) some 6-7 major Ukrainian ammo depots. Seemingly, hardly anything was evacuated from these on time. Later on, they captured at least 2-3, and it turned out that these were 'quite full', too.

....2-3 months later, and Ukrainians are complaining about shortage of ammo.

Think, it's going to be similar on the Russian side, though the effects are likely to be felt already in the coming days - because depots hit by Ukrainians were closer to the frontline, i.e. those for 'intermediate' use, not for 'long term use'.