If Israel attacks Iran, Iran will use what is left of it's missile force to try to attack Israel and it's ally the US. US bases surrounding Iran are bound to come under Iranian attack. The US will have to respond and we will have a large scale asymetric conflict with the Iranians making trouble for the US and it's allies around the world and on Iran's door step. The US will dominate the air and sea and Iran will avoid a conventional set-piece land battle. If The US, UK, France and Australia had any guts or common sense we would try to keep Israel out of this fight by using existing UN Security Council Resolutions to detain and search Iranian ships rather than depend on sanctions that are easily circumvented by Iran. I cannot see this mess ending well. The long term solution must be political, not military because Iran can rebuild it's program in 3 to 5 years.
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from the article: Cries of 'hold me back' may lead Israel to strike Iran