Realpolitik: it doesn't matter who started it. If Ukraine wants western assistance in this fight, they should stop incorporating neo-nazi militias into their national guard.
I don't care who started it. I'm focused on direct threats to myself and my family.
Well you've got to do what you've got to do. But practically speaking, nobody else is obliged to help you.
Well, considering that we're at war, whether we want to acknowledge it or not, we will eventually reach a point where none of us has any choice whatsoever.