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Israel
I don't think the Israeli Air Force has the conventional weapons to take out the Iranian weapons program. The US has capable weapons, which are conventional. That leaves Israel with one choice, use of a nuclear weapon. Bad thing about nuclear weapons is the fallout. Radionuclides are ejected into the atmosphere, then scattered around the entire globe. The radionuclides are then deposited on the grass, and the cows eat the grass. The kids drink the milk from the cows. Then come the cancers worldwide.
It is a real dilemma, but I am sure the Iranians have one nuclear weapon. I don't believe they have a really good delivery system. If Iran does manage to strike Israel, then that gives Israel reason to strike Iran with nuclear weapons. I wish Iran would surrender their weapon to the UN, but it is unlikely. Best option is a UN mandate authorizing military action against Iran. I would not be surprised if Iran actually has Moscow as its target, as revenge for supplying the Arab world with weapons. I know it sounds far fetched, but so was Billy Mitchells statements about the Japanese to the US Congress...