This is coolbert:
Russian reserve [moth-balled] tanks brought out of storage and sent to the Ukraine battlefield found to be inoperative? Theft of internal components vital to optimal operation stolen..
The tip from Sasha. Source a Ukrainian web site.
"Occupiers [Russians] try to recover losses at the expense of vehicles taken from long-term storage. In particular, the enemy is deploying a repair and rehabilitation base (RRB) at the airfield in Klimovo, Bryansk region (35 km [22 miles] from the Ukrainian border). Currently, the enemy RRB is trying to 'put into operation' many vehicles arriving from long-term storage facilities. The condition of these vehicles is mostly extremely poor, which makes their full use impossible."
PRECIOUS METALS AS CAN BE EXTRACTED FROM ELECTRONIC COMPONENTS A MAIN OBJECTIVE OF THE THIEVES.
We are talking here about high-technology bells-and-whistles stuff such as laser range finders, night-vision-optics, spread-spectrum radio with embedded encryption, etc.
Nor can any of that gear be so easily replaced. A modern main battle tank requires the output of up to two-hundred factories during the assembly process.
I stress here "optimal" as the key word. Tanks even when stripped of high-tech gear can still function but in a less that satisfactory manner.