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https://twitter.com/Jonpy99/status/19505722534833071641. Russia pulled most of the tanks that were already in working condition from storage right after the mobilization started, in order to equip new units and quickly replace losses. This is why we started seeing un-upgraded T-54/55, T-62, and T-72Ural tanks at the front.
2/ Here are the equipment numbers visible on satelite images. Almost 11000 towed artillery units, self-propelled guns and towed mortars have been removed from visible storage since the start of the invasion.
2/ First of all I would like to explain the new ID system. I tried to make more use of measuring the guns to put them into categories. I would like to thank @bentanmy , for looking into which systems might be in storage based on guns removed for exhibits.https://x.com/bentanmy/status/1824699109623861650
2/ Many bad assesments of Russian equipment are based on numbers from , which in turn seems to be at least partially relying on the Wikipedia article I mentioned above:globalfirepower.com
2/ The main reason I am writing this thread is that the only other source (except our previous counts) is The Military Balance 2022 (10200 tanks: 7000 T-72, 3000 T-80 and 200 T-90), which they have later corrected in TMB2023 and TMB2024.
2/ First of all here are the numbers of tanks of each type removed from storage, which will be relevant for this thread. Keep in mind that there are a lot of uncertainties with these numbers and this is only the storage visible on satelite images.

2/ First of all here are the numbers in a table and you can also find them in the video linked below.
2/ The base had multiple image updates since 2022 and I made a graph showing the decline in stored towed artillery. Since the start of the invasion towed artillery pieces were removed at a rate of ~17.5 units per month, but there havent been any changes since May 2023.
2/ As usual here is an overview of data for two of the most numerous systems in Russian service (BM-21 Grad and BM-27 Uragan). 
2/ Below you can see a chart showing the share T-72s among the tank losses recorded by Oryx. I got the data from raptorama7 on the @projectowlosint Discord. Although the decline has slowed over time a general decrease can be observed.
2/ The updated Google Earth image is very clear, which helps a lot with identifying the guns. The IDs for 2024 are probably very accurate, but I am still not totally confident in my identififcations in the pre war footage.
2/ As usual here is an overview of the D-30s stored at the storage bases counted from satelite images. As you can see the images used to count the number of remaining units are often quite old so the real number is likely much lower.
2/ Below you can see a large table showing the numbers for each base including the dates of the satelite images that were used to do the count. All threads for the individual types are linked at the end. Keep in mind that some images are old and the bases might have changed.
2/ First of all here is an overview of the numbers by base including the dates of the satelite images I used to make this count. We made some errors regarding this type which is why the numbers are different form the last count although there is no new footage.
2/ First of all here is an overview of the numbers. This system seems to have one of the highest removal rates of all towed artillery, considering that by now likely more than 80% of their pre-war stocks have been removed.
2/ Since there is a higher number of vehicles and bases here is an overview of the numbers. Russia has at least removed 288 (~48%) and some of the remaining 2S5 have had their gun removed.
2/ As with the 2S4 finding the M-46 is easy since they are all stored at one base near Shchuchye which I usually refer to as Planovyi. This base has three spots with M-46 towed artillery holding 676 guns in 2020. 

2/ Finding the russian stock of 2S4 is not hard, since they are all stored at the 94th arsenal in Omsk. The numbers of 2S4 at this first spot have dropped from 193 in 2021 to roughly 120 in January of 2024, with few units being cannibalized. 