Estimates of Russian stocks long before this war began. Much of the Russian arsenal has long been fairly accurately estimated. Most of the weapons used in this war have been those without an issue regarding “shelf life” -and Russian stockpiles have been well-known to be massive. Russia long ago began preparing supplies for a war basically against the world, but particularly NATO. The munitions expended in Ukraine are a drop in the bucket. It really is fairly elementary.
The Russians can’t replace much of their weaponry because the Russians have destroyed the Ukrainian factories that produced most of that equipment.
It’s really unknown at this point if Russia actually has extensive reserves or stores of weaponry because so many of their pre-1991 armories have been deactivated or abandoned. Lots of videos on the net to support this observation.
Russian arms sales over the past thirty years have drawn down much of the vast armories of the USSR. It’s been easy money for the oligarchs and the government to just pack up and sell stuff with practically no overhead.
So what really remains of all of that stuff? And how can Russia replace it when 1) most of the USSR factories were in Ukraine and 2) so was the know-how to make this stuff.
Yes, the Russians can make an indeterminate number of missiles of questionable efficacy, but can they produce warships? Tanks? Armored vehicles? Artillery tubes? Artillery ammunition? Bullets?
So far I’d say no because I have yet to see any claims (even from Russia) of newly produced supplies of military goods.