covertcabal and himarsed have done an updated count of afv in rus storage yards. (numbers at the 6min mark)
they changed their assessment criteria/categories due to the nature of the degraded condition of the remaining. decent/poor/worst
they are down to 3000 ish left with maybe <1000 in decent but probably nonfunctional condition but able to be repair/refurbished. the rest are tanks crammed nose to butt shoulder to shoulder and havent been moved in a decade and thus cant have been maintained. the worst are hulls missing turrets and other parts so they should be considered spare parts at best.
at current attrition rates they estimate rus will run out of tanks in 1.5 to 4 years depending on how many of the poor are just scrap.