If you'll indulge my inner 8 year old field marshal, I'd like to see the AFU knockdown, cut, and tear up every power transmission cable coming out of the Kursk Nuclear Power Plant. It supplies power for steel manufacturing...okay, a butt ton of stuff. This, with the taking of the gas metering center in Sudzha, can really hurt the Russian economy. If the AFU were to knockout a few railroad interlockings, where the tower/signal boxes control a network of switches, that'd really hurt.
I pay attention to the news about Russian railroads. They're operating (barely) under penalty of death if they don't deliver.