WALTER RUSSELL MEAD: Russia’s Nightmare and the Danger of Abandoning Assad. “Someone is killing Russia’s pro-government, moderate, Muslim clerics. . . . From Syria to the Caucasus to Tatarstan and Moscow, radical Sunnism is a force the Russian authorities cannot ignore. But it is easier to recognize the danger than to fight it effectively, and nothing the Kremlin has tried so far has had much success.”