The base in Parchin where Iran conducted nuclear tests - Google Earth, GeoEye
The base in Parchin where Iran conducted nuclear tests. Photo by Google Earth, GeoEye
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Dempesy and Hague
U.S. Joint Chiefs of Staff Gen. Martin Dempsey, left, and British Foreign Minister William Hague.

The U.S. and Britain on Sunday urged Israel not to attack Iran's nuclear program as the White House's national security adviser arrived in the region, reflecting growing international jitters that the Israelis are poised to strike.

In their warnings, both the U.S. joint chiefs of staff, Gen. Martin Dempsey, and British Foreign Minister William Hague said an Israeli attack on Iran would have grave consequences for the entire region and urged Israel to give international sanctions against Iran more time to work. Dempsey said an Israeli attack is "not prudent," and Hague said it would not be "a wise thing."

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Both Israel and the West believe Iran is trying to develop a nuclear bomb - a charge Tehran denies. But differences have emerged in how to respond to the perceived threat.

The U.S. and the European Union have both imposed harsh new sanctions targeting Iran's oil sector, the lifeline of the Iranian economy. With the sanctions just beginning to bite, they have expressed optimism that Iran can be persuaded to curb its nuclear ambitions.

On Sunday, Iran's Oil Ministry said it has halted oil shipments to Britain and France in an apparent pre-emptive blow against the European Union. The semiofficial Mehr news agency said the National Iranian Oil Company has sent letters to some European refineries with an ultimatum to either sign long-term contracts of two to five years or be cut off. The 27-nation EU accounts for about 18 percent of Iran's oil exports.

Israel has welcomed the sanctions. But it has pointedly refused to rule out military action and in recent weeks sent signals that its patience is running thin.

Israel believes a nuclear-armed Iran would be a threat to its very existence, citing Iran's support for Arab militant groups, its sophisticated arsenal of missiles capable of reaching Israel and its leaders' calls for the destruction of the Jewish state.
Last week, Israel accused Iran of being behind a string of attempted attacks on Israeli diplomats in India, Georgia and Thailand.

There is precedent for Israeli action. In 1981, the Israeli air force destroyed an unfinished Iraqi nuclear reactor. And in 2007, Israeli warplanes are believed to have destroyed a target that foreign experts think was an unfinished nuclear reactor in Syria.

Experts, however, have questioned how much an Israeli operation would accomplish. With Iran's nuclear installations scattered and buried deep underground, it is believed that an Iranian strike would set back, but not destroy, Iran's nuclear program.

There are also concerns Iran could fire missiles at Israel, get its local proxies Hezbollah and Hamas to launch rockets into Israel, and cause global oil prices to spike by striking targets in the Gulf.

In an interview broadcast on CNN Sunday, Dempsey said Israel has the capability to strike Iran and delay the Iranians "probably for a couple of years. But some of the targets are probably beyond their reach."

He expressed concern that an Israeli attack could spark reprisals against U.S. targets in the Gulf or Afghanistan, where American forces are based.

"That's the question with which we all wrestle. And the reason that we think that it's not prudent at this point to decide to attack Iran," Dempsey said.

Describing Iran as a "rational actor," Dempsey said he believed that the international sanctions on Iran are beginning to have an effect. "For that reason, I think, that we think the current path we're on is the most prudent path at this point."

"I believe it is unclear (that Iran would assemble a bomb) and on that basis, I think it would be premature to exclusively decide that the time for a military option was upon us," Dempsey said.

The arrival of White House National Security Adviser Tom Donilon was the latest in a series of high-level meetings between Israel and the U.S.

Last month, Dempsey visited Israel, and next month, Prime Minister Benjamin Netanyahu is expected to visit the White House.

Donilon was set to meet with Netanyahu late Sunday, and with Israeli Defense Minister Ehud Barak on Monday before leaving.

Asked whether he believed Israel could be deterred from striking, Dempsey said: "I'm confident that they understand our concerns, that a strike at this time would be destabilizing and wouldn't achieve their long-term objectives. But, I mean, I also understand that Israel has national interests that are unique to them."

Hague delivered a similar message in Britain. Speaking to the BBC, he said Britain was focused on pressuring Iran through diplomatic means.

"I don't think a wise thing at this moment is for Israel to launch a military attack on Iran," he said. "I think Israel like everyone else in the world should be giving a real chance to the approach we have adopted on very serious economic sanctions and economic pressure and the readiness to negotiate with Iran."

In a sign that the diplomatic pressure might be working, Iran's foreign minister said Sunday that a new round of talks with six world powers on the nuclear program will be held in Istanbul, Turkey. Ali Akbar Salehi didn't give any timing for the talks.

The last round of talks between Iran and the five permanent members of the UN Security Council plus Germany were held in Istanbul in January 2011 but ended in failure.