"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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