I'm not sure if they're randomly lashing out like some people believe or if theres a deeper meaning behind the infrastructure attacks.
The last week, AFU has been operating on the assumption that Russia is criminally understaffed. But if Ukraine has underestimated the actual amount of Russian troops, they may be in very deep shit as Russia is now hitting targets that will severely complicate Ukrainian attempts to retreat.
As Russians retreated, some stuff was left behind. Suspiciously undamaged BMPs, and 2 radar vehicles. Nothing irreplaceable for the RF, but why not drive away fully functional (or at least mobile) vehicles? Or at least throw a grenade down the hatch when leaving. Of course pro Ukraine people will just say it is because Russians are idiotic and dumb so on but even the least trained conscript can follow orders to yeet a grenade if the central command orders it.
People on both sides are hyper fixated on Russia evening the numbers gap by mobilizing, but that isn't the only way to create a pitched battle that favors Russia. Another way to do it would be to deceive Ukraine about how many Russians there are in an area, creating local numerical superiority or at least parity.
AFU is now assuming A: there are about 200 000 Russian troops and B: the defenders of Izyum have moved to the Donetsk direction, losing much of their equipment while doing so. If these assumptions are false, then the forces committed in Izyum are at great risk.
I'd keep my eyes peeled for more infrastructure attacks in the coming days, especially against the Kharkiv front logistic lines.