It is rather simple, they didn't want to really destroy UAF, but were hoping after initial attack that a lot of them would surrender and switch side, as there i

It is rather simple, they didn't want to really destroy UAF, but were hoping after initial attack that a lot of them would surrender and switch side, as there is a lot of unhappiness in Ukraine over how they treat Russians, right wingers and pro-nazi groups with guns. So they expected a lot of infrastructure will be available for them to take over. As we know, this didn't happen and now they have to destroy it. Honestly this is not good for Ukrainians as they will now suffer for real. I found this site provides somewhat better analysis of situation, as well as The Hill and Breaking Points for example. http://www.iswresearch.org/ http://www.iswresearch.org/