Already planned are naval exercises and new antimissile systems in the Persian Gulf, and a more forceful clamping down on Iranian oil revenue. The administration is also considering new declarations by President Obama about what might bring about American military action, as well as covert activities that have been previously considered and rejected.
Later this month the United States and more than 25 other nations will hold the largest-ever minesweeping exercise in the Persian Gulf, in what military officials say is a demonstration of unity and a defensive step to prevent Iran from attempting to block oil exports through the Strait of Hormuz. In fact, the United States and Iran have each announced what amounted to dueling defensive exercises to be conducted this fall, each intended to dissuade the other from attack.
The administration is also racing to complete, in the next several months, a new radar system in Qatar that would combine with radars already in place in Israel and Turkey to form a broad arc of antimissile coverage, according to military officials. The message to Iran would be that even if it developed a nuclear weapon and mounted it atop its growing fleet of missiles, it could be countered by antimissile systems.
The question of how explicit Mr. Obama’s warnings to Iran should be is still a subject of internal debate, closely tied to election-year politics. Some of Mr. Obama’s advisers have argued that Israel needs a stronger public assurance that he is willing to take military action, well before Iran actually acquired a weapon. But other senior officials have argued that Israel is trying to corner Mr. Obama into a military commitment that he does not yet need to make.
On Sunday, Prime Minister Benjamin Netanyahu appeared to criticize Mr. Obama for being too vague about how far Iran can go. “The international community is not setting Iran a clear red line, and Iran does not see international determination to stop its nuclear project,” he told his cabinet. “Until Iran sees a clear red line and such determination, it will not stop the progress of its nuclear project — and Iran must not be allowed to have nuclear weapons.”
None of the steps being taken by the Obama administration addresses the most immediate goal of the United States and its allies: Slowing Iran’s nuclear development. So inside the American and Israeli intelligence agencies, there is continuing debate about possible successors to “Olympic Games,” the covert cyberoperation, begun in the Bush administration and accelerated under Mr. Obama, that infected Iran’s nuclear centrifuges and, for a while, sent them spinning out of control. An error in the computer code alerted Iran to the attack in 2010, and since then many of the country’s nuclear sites have been modified to defend against such attacks, according to experts familiar with the effort.
All of these options are designed to buy time — to offer Israeli officials a credible alternative to a military strike that would almost certainly trigger an Iranian reaction and, the White House and Pentagon fear, could unleash a new conflict in the Middle East. While Mr. Obama’s national security team has been very closed-mouthed about the tense discussions with Mr. Netanyahu, the chairman of the Joint Chiefs of Staff, Gen. Martin E. Dempsey, gave voice to the concerns in London on Thursday.
General Dempsey repeated the familiar American position that an Israeli attack would “clearly delay but probably not destroy Iran’s nuclear program.”
But then he went beyond any warning that Mr. Obama has given to Israel in public, saying that the international coalition of countries applying sanctions against Iran “could be undone” if the country was attacked “prematurely.” He added: “I don’t want to be accused of trying to influence, nor do I want to be complicit if they choose to do it.”
United States intelligence officials have said they have no evidence that Iran’s top leaders have decided to take the final steps toward a weapon. Iran’s intentions remain unclear, intelligence officials say.
Last week, the International Atomic Energy Agency reported an increase in the number of centrifuges that Iran has installed in an underground enrichment plant that is largely invulnerable to Israeli attack, but also indicated that Iran has converted some of its most highly enriched fuel to a form that would be difficult to use in a weapon.
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