Maybe, but lest we forget, the Syrians did shoot down a Turkish F-4 a few months back, and the Turks have shot down a couple of Syrians since. And the Turks are supporting the rebels the Russians are bombing.
I can recall discussing, (many, many, years ago, when the Shah was still in power and after a USAF C-130 was reputedly meakoned across the border and shot down) on the relationship between the Iranians and the Russians; did they have any border problems I asked?
"None whatsoever" the Iranian colonel replied; "if we cross the border they shoot us down; and if they cross the border we shoot them down."