Frankly, I wouldn't be surprised if developed countries start refusing entry even to educated Americans on general principle. We fucking suck, and we've burned a lot of what little good will we have as a people.
And even if you did get in, you would probably have to deal with that animosity from the locals.
The laws on warcrimes have always been a sort of mutual agreement, and they often end up being broken in reciprocity. One side commits perfidy, the other side is less inclined to take prisoners alive in return, as happened in the WWII Pacific theater.
I think its naive to think that there can ever be such a thing as a "good clean war" with the international community acting as objective and powerful referees throwing around red cards.
Russia hasn't given a fuck about UXO in civilian areas for the entirety of the war, so I don't see this as being an escalation. It's their land, they'll have incentive to take caution in their use.