CAIRO ? With missile batteries, fleets of attack boats and stocks of naval mines, Iran can disrupt traffic through the Strait of Hormuz but probably cannot completely shut down the world's most important oil route, military analysts say. The question for Iran's leadership is whether it is worth the heavy price.
Trying to close the strait would bring down a powerful military response on Iran's head from U.S. forces in the Gulf and turn Tehran's few remaining international allies against it.
That Iran is making such dire threats at all illustrates its alarm over new sanctions planned by the U.S. that will target oil exports ? the most vital source of revenue for its economy. Iran's leaders shrugged off years of past sanctions by the U.S. and United Nations, mocking them as ineffective. But if it cannot sell its oil, its already-suffering economy will be sent into a tailspin.
"It would be very, very difficult for Iran even to impede traffic for a significant period of time," said Jonathan Rue, a senior research analyst at the Washington-based Institute for the Study of War. "They don't have the ability to effectively block the strait."
What the Iranians can do, Rue and other analysts say, is harass traffic through the Gulf ? anything from stopping tankers to outright attacks. The goal would be to panic markets, drive up shipping insurance rates and spark a rise in world oil prices enough to pressure the United States to back down on sanctions.
The strait would seem to be an easy target, a bottleneck only about 30 miles (50 kilometers) across at its narrowest point between Iran and Oman.
Tankers carrying one-sixth of the world's oil supply pass through it, from the fields of petrogiants Iran and its Gulf Arab neighbors, exiting the Persian Gulf into the Arabian Sea and on to market. They move through two two-mile-wide shipping lanes, one entering the Gulf, one exiting.
In recent years, Iran has dramatically ramped up its navy, increasing its arsenal of fast-attack ships, anti-ship missiles and mine-laying vessels. Its elite Revolutionary Guards boasts the most powerful naval forces, with approximately 20,000 men, with at least 10 missile patrol boats boasting C-802 missiles with a range of 70 miles (120 kilometers) and a large number of smaller patrol boats with rocket launchers and heavy machine guns, according to a recent report by Anthony Cordesman at the Center for Strategic and International Studies.
The navy has three submarines and an unknown number of midget subs, capable of firing "smart" torpedoes or laying mines. It also has a large scale capability for laying mines using both small craft and commercial boats, according to the report.
The Revolutionary Guard has also deployed a heavy array of anti-ship Seersucker missiles with a range of up to 60 miles (100 kilometers) along its coast overlooking the strait, on mobile platforms that make them harder to hit.
The Guard's naval forces and the regular navy "have been the most favored service. The Iranian air force and ground forces have not seen the same level of attention in domestic procurement and weapons systems," Rue said. "They realize their navies are the best options for inflicting casualties" on the U.S. or Arab Gulf nations.
Still, those forces would not likely be enough to outright seal the strait, given the presence of the U.S. 5th Fleet based in the Gulf nation of Bahrain. On Wednesday, Pentagon spokesman George Little warned that any "Interference with the transit or passage of vessels through the Strait of Hormuz will not be tolerated."
Laying minefields in the Hormuz waters would in theory be the most effective action, forcing time-consuming clearing by U.S. forces and their allies before tankers could move through.
But particularly strong currents in the strait make such mining difficult. Moreover, the U.S. and its Gulf allies have extensive surveillance in the area, meaning the Iranians would have little time to set an effective minefield, Rue said. The United Arab Emirates and Saudi Arabia have both extensively increased their anti-mining capabilities.
Iran's anti-ship missile batteries on the coast are another major threat. But while the missile platforms are mobile, the radar facilities that enable them to target shipping largely are not, making them vulnerable to U.S. strikes.
"It wouldn't be a cakewalk" for U.S. and other forces to push back an Iranian attempt to close the strait, Rue said. But in the end, "their capabilities are not great and ours overwhelmingly outmatch theirs."
The closest parallel may be the 1980-88 Iran-Iraq war, when each side attacked shipping in the Gulf, trying to cut off the other's vital oil revenues. More than 500 ships were damaged in attacks, and Iranian mining and assaults prompted a U.S. operation escorting Kuwaiti tankers. But while oil shipments from the Gulf slowed, they came nowhere close to stopping.
Alireza Nader, an analyst at the RAND Corp., said Iran could start with lower-level moves short of outright attacks.
"It could harass shipping, stopping and searching ships. We could see those kind of provocative steps," he said.
But turning to military moves raises the danger for Iran of retaliation. And trying to close the strait could be disastrous for Tehran.
"If the benefits are higher than the costs, it could take that action, but it's difficult to see how that could be because of how bad the fallout would be," Nader said. "It's economic self-sabotage."
Hormuz is in the territorial waters of Iran and Oman, but it is considered an international strait where free passage is guaranteed, meaning that under international law, closing it by any nation would be considered an act of war. Russia and China, Iran's main allies that have protected it from stronger U.N. sanctions, would have little choice but to respond. Russia, which now has oil production contracts in Iraq, and China, which relies on the region for its supplies, also have no interest in seeing traffic stop, said Olivier Jakob of the Switzerland-based oil monitor Petromatrix.
Hormuz's closure would also be a heavier blow to Iran than any sanctions hitting the approximately 2.5 billion barrels a day of oil it exports, which provide some 80 percent of its revenue. Not only do all of its oil exports go through the strait, but also most of its imports, including vital gasoline supplies.
"A full shutdown would really be the worse case for Iran. That's their last bullet," Jakob said.
Given that, U.S. officials have expressed doubts Iran would carry out the threat. State Department spokesman Mark Toner called Iran's warnings merely "more rhetoric."
Iran has threatened to close the strait in the past, but in response to a U.S. or Israeli attack on its nuclear facilities. Now it has stepped it up a notch as a possible retaliation to sanctions, reflecting the degree of worry over the planned U.S. sanctions aimed at stopping its nuclear program,
The sanctions would ban transactions with the Iranian Central Bank. Countries and companies around the world use the bank to finance purchases of Iranian oil, meaning they would either have to stop buying it or face action from Washington.
Halting ? or even denting ? oil income would be devastating to an economy that is already struggling amid its international isolation. The value of Iran's riyal is now 15,200 to the dollar, from 10,500 a year ago. Cash withdrawals from banks have been restricted.
Prices of food and grocery items like milk have increased up to 20 percent in recent months. In an attempt to cut its budget, the government recently ended subsidies on fuel and some foods, sending gas prices up sevenfold and quadrupling bread prices. In place of subsidies, the government gives direct payments of $40 a month to poor families to pay for necessities.
The threats also reflect a worry among Iran's leaders that its oil can be replaced on the market by Arab producers, particularly Saudi Arabia, without too great an increase in world prices, said Mustafa Alani, a Geneva-based analyst with the Gulf Research Center. That makes a cutoff a viable option for the U.S., and if that happens "the economy will collapse."
"All the noise about Hormuz is linked to the feeling that it is possible, and they say, 'if we go down, we will take everyone with us.' If Iranian oil stops, then all the oil stops," he said.
But in the end, "I don't think they are willing to do it because the consequences would cost them too much," Alani said. "I don't think they are so stupid."
___
AP correspondents Nasser Karimi in Tehran, Sinan Salaheddin and Rebecca Santana in Baghdad contributed to this report.
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