Bashar al-Assad -- with Russian-trained military advisers and Russian military equipment -- has done the same thing on a small scale in Qusayr last week and is intending to the same thing to Aleppo, a rather large city. He'll probably do it in July, when the world's foreign policy elites are en vacances and the best we can hope for is a statement of condemnation tapped out on someone's Blackberry.
Don't we say Never Again after each one of these things? Heckuva job.