Every day the Iranian program becomes more difficult to dislodge -- as the uranium is concentrated, the number of centrifuges required to complete the process decreases, allowing the remaining refining operation to be moved to smaller and more covert facilities.
America, ostensibly Israel's ally, is rumoured to have ordered US warships to shoot down Israeli aircraft, should a strike on Iran appear to be in progress. According to Israeli newspapers, President Obama thwarted a planned 2014 Israeli attack against Iranian nuclear facilities, by threatening to shoot down the Israeli bombers.
America is currently sending additional warships to the Persian Gulf -- ostensibly to blockade Iranian supply runs to rebels in Yemen, but if rumours of President Obama's threat against Israel are correct, perhaps also to reinforce US firepower, should Israel decide to mount an attack against Iran.
Might enjoy a higher degree of success if the operation is launched prior to Russian S-300's being made fully operational.