The UN is based on the principle of self-determination. The vast proportion of the World's current borders were not drawn on that principle, but on a whole bunch of highly dubious expediencies such as naked self-interest by dictators/aristocracy, defendable geographic features or administratively convenient straight lines.
The next century is going to be very messy. There will be '**** like this' happening every year. I expect there will be a lot of ethnic or religious 'cleansing', most of it self-conducted by minorities moving to safety.
The current crop of short-termist political animals running the West are very poorly equipped to deal with this, especially since their primary concern, as they are their paymasters, is big business.
We need a long view, and some kind of process for regions to determine their own government which is not necessarily connected to current borders. If a peaceful way to do this cannot be found, then the Ukraine, Syria, Iraq, CAR and half a hundred other places will keep descending into/remain in very nasty conflicts for which the term 'civil war' is too clean-cut.
Furthermore, any attempt to take in even 10% of the refugees will bankrupt the western democracies - there will simply be far too many refugees.