Did America act against North Korea, Pakistan, Syria, Iraq when they were building nuclear reactors ? No, they just emitted a lot of hot air just like today. Israel acted promptly against Osirak & Syrian nuclear reactors (despite American & European objections), else those Scuds that hit Israel in the Gulf War in 1991 would have had Nuclear warheads on them. And who benefitted the most from Osirak attack ? Obviously America, they were able to throw Saddam out from Kuwait & invade Iraq easily. If Saddam had a few nukes, he would have been the Emperor of the Middle-East by now !
EU's Mogherini in Tehran to talk nuclear deal, regional issues (Reuters)