The idea of a renewed shooting war between the two should be enough to raise a greater level of concern than is currently being expressed by the international community.
What does more harm to the liberal international order: violating the principle that only the Security Council can permit the invasion of another country, or letting the Syrian regime flaunt international humanitarian law by continuing its massacre?
How diluted can this resolution get and still have a political effect of isolating the Assad regime internationally and emboldening internal dissidents?