do as much damage as possible to the Russians for them.
By blowing the eastern side of their own country to bits?
I definitely think damaging/blocking the infrastructure around grain production has emerged as a strategy/tactic. I'm not so sure it was plan a. They took serious losses in the initial assault on kiev, in the past month they've failed (for now) in the stated attempt to take the whole of the eastern regions - again with significant loses.
I'm just kinda channelling UTM here as he's really really well read on history, but he tends to say that russian just has never had any issue with putting endless troops into a meat grinder to win a war. Putin has spent his life installing himself somewhere in the power structure of all the major russian resources. Would he then see ukraine as a pride victory or as a massive coalfield and steel resource?