I am at work, and as such, have no access to TV or other news sources, so if this is being discussed, I haven't yet heard.
Do we know from decent sources what the Russian Rules of Engagement are for the current conflict?
Ukraine is a (relatively) small country and it shares borders with Poland and Hungary, among others.
My concern is Ukrainians in active conflict with Russians may flee across the borders and into EU territory. I know there are no painted lines through the woods and fields, and I am assuming there is also no actual fence line surrounding Ukraine. It concerns me that Polish and Hungarian citizens may be drawn into the conflict which would again, enlarge it.
Of course, the other way works as well. What if the conflict spills over into any neighboring countries that aren't either of the primary combatants?