Ever since the times of the Secessionist War in the USA, there's something called 'offensive…

Chornobaivka could be a perfect situation for something similar: Ukrainians taking at least a chunk of the place, then letting the Russians…

Ever since the times of the Secessionist War in the USA, there's something called 'offensive defence'. Think, it was General Lee (Confederates) who perfected it: he would advance to a point of his choice, then entrench and let the Federates suffer incredible casualties while assaulting him.

Chornobaivka could be a perfect situation for something similar: Ukrainians taking at least a chunk of the place, then letting the Russians bleed themselves to death while counterattacking them.