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The former Massachusetts governor and presidential hopeful, Mitt Romney, on Monday blasted U.S. President Barack Obama's outreaches to Iran as failing to thwart the Islamic Republic's nuclear ambitions.

"Stop thinking that a charm offensive will talk the Iranians out of their pursuit of nuclear weapons. It will not," Romney told the American Israel Public Affairs Committee, a major American Jewish lobby.

"Agreements, unenforceable and unverifiable, will have no greater impact here than they did in North Korea. Once an outstretched hand is met with a clenched fist, it becomes a symbol of weakness and impotence."

The possible 2012 presidential contender's comments came after a new round of talks between Iran and world powers began in Vienna on Monday aimed at easing concerns about Tehran's nuclear intentions.

At the summit, Romney stressed that the negotiations would achieve nothing.

"The Iranian regime is unalloyed evil, run by people who are at once ruthless and fanatical," he said. "The Iranian leadership is the greatest immediate threat to the world since the fall of the Soviet Union, and before that, Nazi Germany."