Except that this is not a civil war but an old-school war of conquest. If the war ends in a way that doesn't include Russia withdrawing behind the 1991 borders,

Except that this is not a civil war but an old-school war of conquest. If the war ends in a way that doesn't include Russia withdrawing behind the 1991 borders, it goes a long way towards restoring the pre-WW2 world order, where conquest is a legitimate reason to start a war.