This is no rocket science, you know what salvage is right? think of it like that, salavage the situation or die? I think the choice is quite easy. Only way for Ukriane to win is for US to send toops and fight and it still will not go their way like in vietnam ...now is the time for negoration freeze current lines of contact before it get completely out of hand.
Why can't politicians use their brains and salvage what's left of Ukraine? Just have a huge DMZ west of the Donbas, it's the only logical solution.