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> Well the South front is much more important
No. Just wrote it why.
> capture Zaporizhya
The city? Capturing it would be a nightmare. It is very hard to fight in urban environment, and it would destroy the city.
> they can basically destroy UA logistics.
They want Ukraine to send more and more crap to the front. They don't want to destroy Ukrainian logistics.
Russia is waging an attritional war. The point is to destroy the war material - the troops, the weapons, the equipment. They put strain on Ukraine. They want to tank the morale. Ground made is a byproduct of attrition.
Controlling, channeling the opposition logistics sure. But not destroying it.
In fact one point of attrition would be denying successes, because it is very destructive for morale to see nothing but failures. So Kupyansk was really a mistake on behalf of Russia.