Netanyahu told the U.N. General Assembly that unless stopped by the international community, Iran could have enough enriched uranium for a nuclear weapon by next summer. He did not threaten to attack Iran, and he said that the United States and Israel are pursuing a united effort to stop the Islamic Republic from developing a weapon.
Near the end of his speech, Netanyahu held up a placard showing a cartoon-like bomb that divided Iran's efforts into three stages. He said that Iran has completed the first stage, developing sufficient low-enriched uranium, and that it is nearing completion of the second stage, the further enrichment of the uranium to weapons grade.
He said that stage could be completed as soon as next summer and that the third stage, preparing an actual weapon, could then be accomplished within "a few months, possibly a few weeks." He said the effort to build a detonator for the highly enriched uranium would be relatively simple and easily concealed.
Drawing a bright red line across the picture with a marker, he said that Iran must be stopped before it completes the second stage.
"I believe that faced with a clear red line, Iran will back down," Netanyahu said in the 30-minute address.
Iran's fast-moving nuclear development program has shadowed the U.N. gathering this year. In his address to the U.N. assembly on Tuesday, President Barack Obama said the United States would do what it must to stop Iran from getting a nuclear bomb.
Obama opposes a unilateral Israeli strike now and has said he would authorize a U.S. attack only as a last resort. He insisted Tuesday that there is still time and diplomatic elbow room to negotiate a peaceful end to the most troublesome elements of Iran's program.
U.S. military and intelligence officials have said that an attack by Israel could ignite chaos and drag the United States into a new Mideast war. They also argue that an Israeli strike would be unlikely to completely destroy the Iranian program, possibly leaving the United States to finish the job.
During the past six months, Netanyahu has made an increasingly public case for a unilateral Israeli attack on Iran sometime soon.
Israel considers Iran its mortal enemy, and Israeli leaders say they cannot afford to risk a nuclear weapon in the hands of a clerical regime pledged to Israel's destruction.
Netanyahu and his defense minister, Ehud Barak, argue that Iran is moving its sensitive nuclear work deep underground and out of the reach of Israeli conventional bombing capability. Israeli officials privately argue that a quick strike now would damage the program severely and buy more time for diplomacy.
Israel is presumed to have a modest stockpile of nuclear weapons, but it does not admit the stockpile's existence and has not threatened to use them in Iran.
Only the United States has the heavy, long-range conventional weapons capability necessary to completely eradicate the Iranian program.
The Obama administration has been irritated by what many advisers see as Israeli threats and pressure. Obama has so far refused to set a deadline for Iran to back down or to publicly outline what Iranian nuclear milestone would trigger a U.S. attack.
The Israeli demand for a U.S. "red line" on Iran is the latest point of conflict in a testy personal relationship between Obama and Netanyahu.
Although U.S. officials regularly profess unshakable alliance with Israel, the two leaders have done little to hide their mutual suspicion and dislike.
Obama and Netanyahu did not meet on the sidelines of the U.N. meeting as U.S. and Israeli officials have often done in the past. Obama's decision to hold no such one-on-one meetings with foreign leaders this year was widely seen as a way to justify that he would not see Netanyahu.
Iran says it is not seeking a nuclear weapon. Iranian President Mahmoud Ahmadinejad, who addressed the U.N. Wednesday, said this week that his country does not rule out a negotiated deal to limit Iran's enrichment of uranium.
Such a deal is the implied goal of U.S.-backed international talks with Iran that have so far shown no progress. Secretary of State Hillary Clinton and diplomats from the other nations negotiating with Iran met later Thursday on the sidelines of the U.N. meeting.
Israeli officials have all but dismissed the negotiation efforts by the United States, Britain, France, China, Russia and Germany as hopeless.
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