Barak, speaking on CNN's Fareed Zakaria GPS program, indicated that Israel's patience was wearing thin -- and provided an ominous response when asked about the growing speculation of an Israeli military strike.

"I don't think that that is a subject for public discussion," he said. "But I can tell you that the IAEA report has a sobering impact on many in the world, leaders as well as the publics, and people understand that the time has come."

The International Atomic Energy Agency published a report on November 8 saying there was "credible" information that Iran was carrying out "activities relevant to the development of a nuclear explosive device."

On Friday the IAEA's board passed a resolution condemning Iran's nuclear activities, but stopped short of reporting Tehran to the United Nations and issuing no deadline for compliance.

"People understand now that Iran is determined to reach nuclear weapons," said Barak. There is "no other possible or conceivable explanation for what they have been actually doing. And that should be stopped."

The IAEA report -- based on "broadly, credible" intelligence, its own information and some input from Iran itself -- said that Iran had examined how to fit out a Shahab 3 missile, with a range capable of reaching Israel, with a nuclear warhead.

Tehran rejected the report "baseless," denies it is seeking nuclear weapons and maintains its nuclear activities are for civilian energy purposes.

Washington, Paris and London however jumped on the report as justification to increase pressure on Iran, already under four rounds of Security Council sanctions and additional US and European Union restrictions.