Russia gave a green light for Iraq or it wouldn't have happened. A similar situation exists with North Korea; there will be no military action unless China is in on it, either actively or passively. If Iran actually launches on Israel, the Russian green light could come immediately, in the context of the pre-agreed mission statement [not made public].
I imagine unpleasant scenarios that proceed without Russia's blessing. The realities of a nuclear-capable Iran firing on Israel are not allowable. We and Israel will stop Iran, and Russia will just have to do what Russia will have to do.