Syrian President Bashar Assad delivered a speech Sunday that had the virtue, at least, of offering clarity. No, he insisted, he would not step down. He would not negotiate with the rebels who control much of the countryside and parts of major cities. He would not consider the compromise “transition” proposal being peddled by a U.N. envoy with the backing of his ally Russia, as well as the United States. Instead, he said, he would fight to the end against “enemies of God and puppets of the West.”