So funny, your diagram won’t even work to sort this one out.
Which is another reason why I think we should sit this one out. No matter who we “help” we’ll end up pissing off one or more allies and give aid to one or more enemies.
Let the UN decide that a war crime was committed and back them to vote to do something. Sure, Russia will veto it, but then they are the ones who look bad. Let the UN bluster on about Russia. For once, it will not be the US that is getting shat upon. If Russia gives in, then make the UN do something about it without us. We’re kind of busy trying to save the world from economic collapse here.