The third invasion has been called off, even if a proxy can be found to start it:
A senior U.S. strategic analyst says the Chairman of the U.S. Joint Chiefs of Staff, Admiral Michael Mullen, sent Israel an unequivocal message stating that Israel does not have a “green light” from the U.S. to attack Iranian nuclear facilities….
Mullen spoke after returning from a visit to Israel, during which he met with Chief of Staff Lt. Gen. Gabi Ashkenazi and other senior IDF officers. Cordesman said Mullen came to Israel to deliver a message that Israel did not have a green light to attack Iran and that it would not receive U.S. support for such a move.
I don’t see how there could ever be any need to attack Iran over nuclear weapons anyhow. Since we are reliably informed that religion prevents scientific development, there’s obviously no way that the Islamic Republic could ever develop modern weaponry. QED.