If Israel hits Iran, the retaliation is going to come against the United States. It will come in the form of "covert" action in Iraq to destabilize the situation. Or in a more open way such as attacking Saudi oil fields, or threatening the Straight of Hormuz. That said, the Iranian Navy is no match for the US Navy, and the US can keep the straight open, even if it results in open war.
I would say that China and Russia would veto any UN action in Iran, but would not intervene in a situation of air strikes or invasion. While these may not be the best moves available, I predict they would stay out of it.
For example, Iraq had big deals with France and Germany before we invaded, and they did a grand total of nothing to stand with Iraq. China is not going to risk losing its largest market (the US) to stand up for Iran. Russia might openly complain about it, but we could cut deals with the missile defense shield to placate their concerns.
Do I want to learn something? Tell me, what foreign policy experience do you have? What makes you qualified to pass on a judgment like this? A nuclear Iran is unacceptable to the interests of the United States, but a nuclear Iran will not threaten the heegemony of the United States.
Says you.
