Something that Halsey continues to say on the Wednesday show which irritates me is that Assad was defeated and Russia didn't do anything even though they were allies. If he has not directly stated it, he has implied it, and he uses this as justification for his thought that Russia doesn't care about Iran.
Assad stepped down and the Syrian military did the same because his generals were for all intents and purposes bought off. Russia can't defend someone who surrenders of their own accord.