The central question—whether Iran will be able to proceed with its plans to enrich uranium—is now before the United Nations, with the Russians and the Chinese reluctant to impose sanctions on Tehran. A discouraged former I.A.E.A. official told me in late March that, at this point, “there’s nothing the Iranians could do that would result in a positive outcome. American diplomacy does not allow for it. Even if they announce a stoppage of enrichment, nobody will believe them. It’s a dead end.”

Another diplomat in Vienna asked me, “Why would the West take the risk of going to war against that kind of target without giving it to the I.A.E.A. to verify? We’re low-cost, and we can create a program that will force Iran to put its cards on the table.” A Western Ambassador in Vienna expressed similar distress at the White House’s dismissal of the I.A.E.A. He said, “If you don’t believe that the I.A.E.A. can establish an inspection system—if you don’t trust them—you can only bomb.”

There is little sympathy for the I.A.E.A. in th Bush Administration or among its European allies. “We’re quite frustrated with the director-general, the European diplomat told me. “His basic approac has been to describe this as a dispute between tw sides with equal weight. It’s not. We’re the goo guys! ElBaradei has been pushing the idea of lettin Iran have a small nuclear-enrichment program which is ludicrous. It’s not his job to push ideas tha pose a serious proliferation risk.

The Europeans are rattled, however, by their growing perception that President Bush and Vice-President Dick Cheney believe a bombing campaign will be needed, and that their real goal is regime change. “Everyone is on the same page about the Iranian bomb, but the United States wants regime change,” a European diplomatic adviser told me. He added, “The Europeans have a role to play as long as they don’t have to choose between going along with the Russians and the Chinese or going along with Washington on something they don’t want. Their policy is to keep the Americans engaged in something the Europeans can live with. It may be untenable.”

“The Brits think this is a very bad idea,” Flynt Leverett, a former National Security Council staff member who is now a senior fellow at the Brookings Institution’s Saban Center, told me, “but they’re really worried we’re going to do it.” The European diplomatic adviser acknowledged that the British Foreign Office was aware of war planning in Washington but that, “short of a smoking gun, it’s going to be very difficult to line up the Europeans on Iran.” He said that the British “are jumpy about the Americans going full bore on the Iranians, with no compromise.”

The European diplomat said that he was skeptical that Iran, given its record, had admitted to everything it was doing, but “to the best of our knowledge the Iranian capability is not at the point where they could successfully run centrifuges” to enrich uranium in quantity. One reason for pursuing diplomacy was, he said, Iran’s essential pragmatism. “The regime acts in its best interests,” he said. Iran’s leaders “take a hard-line approach on the nuclear issue and they want to call the American bluff,” believing that “the tougher they are the more likely the West will fold.” But, he said, “From what we’ve seen with Iran, they will appear superconfident until the moment they back off.”

The diplomat went on, “You never reward bad behavior, and this is not the time to offer concessions. We need to find ways to impose sufficient costs to bring the regime to its senses. It’s going to be a close call, but I think if there is unity in opposition and the price imposed”—in sanctions—“is sufficient, they may back down. It’s too early to give up on the U.N. route.” He added, “If the diplomatic process doesn’t work, there is no military ‘solution.’ There may be a military option, but the impact could be catastrophic.”

Tony Blair, the British Prime Minister, was George Bush’s most dependable ally in the year leading up to the 2003 invasion of Iraq. But he and his party have been racked by a series of financial scandals, and his popularity is at a low point. Jack Straw, the Foreign Secretary, said last year that military action against Iran was “inconceivable.” Blair has been more circumspect, saying publicly that one should never take options off the table.

Other European officials expressed similar skepticism about the value of an American bombing campaign. “The Iranian economy is in bad shape, and Ahmadinejad is in bad shape politically,” the European intelligence official told me. “He will benefit politically from American bombing. You can do it, but the results will be worse.” An American attack, he said, would alienate ordinary Iranians, including those who might be sympathetic to the U.S. “Iran is no longer living in the Stone Age, and the young people there have access to U.S. movies and books, and they love it,” he said. “If there was a charm offensive with Iran, the mullahs would be in trouble in the long run.”

Another European official told me that he was aware that many in Washington wanted action. “It’s always the same guys,” he said, with a resigned shrug. “There is a belief that diplomacy is doomed to fail. The timetable is short.”

A key ally with an important voice in the debate is Israel, whose leadership has warned for years that it viewed any attempt by Iran to begin enriching uranium as a point of no return. I was told by several officials that the White House’s interest in preventing an Israeli attack on a Muslim country, which would provoke a backlash across the region, was a factor in its decision to begin the current operational planning. In a speech in Cleveland on March 20th, President Bush depicted Ahmadinejad’s hostility toward Israel as a “serious threat. It’s a threat to world peace.” He added, “I made it clear, I’ll make it clear again, that we will use military might to protect our ally Israel.”

Any American bombing attack, Richard Armitag told me, would have to consider the followin questions: “What will happen in the other Islami countries? What ability does Iran have to reach u and touch us globally—that is, terrorism? Will Syri and Lebanon up the pressure on Israel? What doe the attack do to our already diminished internationa standing? And what does this mean for Russia China, and the U.N. Security Council?

Iran, which now produces nearly four million barrels of oil a day, would not have to cut off production to disrupt the world’s oil markets. It could blockade or mine the Strait of Hormuz, the thirty-four-mile-wide passage through which Middle Eastern oil reaches the Indian Ocean. Nonetheless, the recently retired defense official dismissed the strategic consequences of such actions. He told me that the U.S. Navy could keep shipping open by conducting salvage missions and putting mine- sweepers to work. “It’s impossible to block passage,” he said. The government consultant with ties to the Pentagon also said he believed that the oil problem could be managed, pointing out that the U.S. has enough in its strategic reserves to keep America running for sixty days. However, those in the oil business I spoke to were less optimistic; one industry expert estimated that the price per barrel would immediately spike, to anywhere from ninety to a hundred dollars per barrel, and could go higher, depending on the duration and scope of the conflict.

Michel Samaha, a veteran Lebanese Christian politician and former cabinet minister in Beirut, told me that the Iranian retaliation might be focussed on exposed oil and gas fields in Saudi Arabia, Qatar, Kuwait, and the United Arab Emirates. “They would be at risk,” he said, “and this could begin the real jihad of Iran versus the West. You will have a messy world.”

Iran could also initiate a wave of terror attacks in Iraq and elsewhere, with the help of Hezbollah. On April 2nd, the Washington Post reported that the planning to counter such attacks “is consuming a lot of time” at U.S. intelligence agencies. “The best terror network in the world has remained neutral in the terror war for the past several years,” the Pentagon adviser on the war on terror said of Hezbollah. “This will mobilize them and put us up against the group that drove Israel out of southern Lebanon. If we move against Iran, Hezbollah will not sit on the sidelines. Unless the Israelis take them out, they will mobilize against us.” (When I asked the government consultant about that possibility, he said that, if Hezbollah fired rockets into northern Israel, “Israel and the new Lebanese government will finish them off.”)

The adviser went on, “If we go, the southern half of Iraq will light up like a candle.” The American, British, and other coalition forces in Iraq would be at greater risk of attack from Iranian troops or from Shiite militias operating on instructions from Iran. (Iran, which is predominantly Shiite, has close ties to the leading Shiite parties in Iraq.) A retired four-star general told me that, despite the eight thousand British troops in the region, “the Iranians could take Basra with ten mullahs and one sound truck.”

“If you attack,” the high-ranking diplomat told me in Vienna, “Ahmadinejad will be the new Saddam Hussein of the Arab world, but with more credibility and more power. You must bite the bullet and sit down with the Iranians.”

The diplomat went on, “There are people in Washington who would be unhappy if we found a solution. They are still banking on isolation and regime change. This is wishful thinking.” He added, “The window of opportunity is now.”

End