U.S. would be viewed as complicit even if Israel strikes Iran unilaterally
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The United States would be viewed by most of the Muslim world and globally as complicit in any attack on Iran regardless of whether it took part in the actual planning or not. In order to effectively attack Iranian nuclear facilities, large numbers of Israeli aircraft would have to repeatedly transit the airspace of Arab nations for a period of days if not weeks. Iraq would be one of the most useful countries in providing air routes. Arab nations would publicly deny they had made their airspace available to the Israelis, but Iraq would find itself, because of geographic proximity, the least credible. According to Giora Eiland, the former head of the Israeli National Security Council, "Israel cannot carry out such a strike [against Iran] without coordination with the Americans so long as they 'are in Iraq.'" Indeed, even a casual glance at a map of the region would suggest he is correct. As the result of any attack, Iran would find its political standing strongly enhanced, and efforts to isolate Tehran diplomatically or economically would collapse.
Israel would face the same limitations and uncertainties that exist for the United States in any strike on Iran's nuclear capabilities, with the added risks of having far less capacity than the U.S. military and the risks of being abandoned by its fragile alliances while setting off a regional war.