Ehud Barak said Israel was focussed on the prospect of a nuclear Iran and what "should and could be done about it on time."
"It's true that it won't take three years, probably three quarters before no one can do anything practically about it because the Iranians are gradually, deliberately entering into what I call a zone of immunity, by widening the redundancy of their plan, making it spread over many more sites with many more hidden elements," he said
Barak, a former Israeli prime minister, said a report earlier this month by the U.N. nuclear watchdog that Tehran appeared to have worked on designing an atomic bomb and may still be conducting secret research had had a sobering effect on world leaders and was driving urgent, intensive diplomacy.
The International Atomic Energy Agency (IAEA) report confirmed long-standing concerns that Iran aims to build a nuclear weapon, which Israel sees as a threat to its existence. Tehran has said its nuclear program is for peaceful purposes.
The United States and Israel have not ruled out possible air strikes on Iran's nuclear sites.
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