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There is the thing called "too early". Just because a place will fall anyway, it doesn't make it right to declare a place captured.
Plus you can never know when an announced place will gets uncaptured, before it really gets captured. See: Kupyansk.
> It is less important than South and Donbas fronts.
No. It is very important to push on all directions simultaneously with similar force. Advance on main directions can't be achieved without the rest. So the rest is just as important.
Plus. The original separatist regions beyond Dontesk and Lugansk were Odessa, Dnipro, and Kharkov in 2014.