On the 21st of August 2010 Iran will put their nuclear reactor on (fitting the nuclear rod is practically putting it on). That means Israel can not bomb it because it would be too dangerous because radiation will spread all over the Persian Gulf including in the water of the Persian Gulf.
John Bolton former US ambassador to the United Nations and a previous Bush adviser said that when Russia put those rods into the Bushehr reactor in Iran, that will be the point of no return. Israel cant attack the reactor then and that would make them (Iran) “imune to assault” as Bolton said.
In 1981 Israel attacked the Iraqi Osirak and the Nuclear plant Syria was building in 2007 before both those places could fit the rod.