>>63936178 (OP)
all advances are essentially channels along logistical supply lines
this is the breakthrough in perspective that enabled airland battle, the front does not consist of a solid line on a map but rather a murky area of control with enemy control being limited to within the thin channel behind them
>>63936178 (OP) > in thin lines
even this chokepoint between Yalta and Zirka is still like 200 yards thick - not that unbelievable, similar stuff did happen during WW 2
also it's proably just extrapolations - like they know that forces are in Zirka and Paddubne so they make a Voronoi diagram out of it or whatever they are called