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At the center of the dispute is international concern over Iran’s nuclear program, which Tehran insists is aimed at providing civilian power. The U.S. and other nations accuse Iran of attempting to build nuclear weapons, and Tehran is now under several rounds of U.N. sanctions over its failures to be forthcoming about its work.

Hammond said recently that Iran was “working flat out” to produce a nuclear weapon.

Australia’s foreign minister Kevin Rudd, in London with Australian defense minister Stephen Smith for talks with British counterparts, said his country would join the EU’s oil embargo.

“We in Australia will undertake precisely the same parallel actions in Australia,” Rudd said. “The reason is very clear — the message needs to be delivered to the people of Iran, the wider political elites of Iran, as well as the government of Iran that their behavior is globally unacceptable.”

Iran responded angrily to the new EU sanctions Monday, with two lawmakers escalating threats that their country would close the Strait of Hormuz. Lawmaker Heshmatollah Falahatpisheh said Iran had the right to shutter Hormuz in retaliation and that the closure was increasingly probable, according to the semiofficial Mehr news agency.

“In case of threat, the closure of the Strait of Hormuz is one of Iran’s rights,” Falahatpisheh was quoted as saying. “So far, Iran has not used this privilege.”

Some commentators are declaring that Iran should cut the flow of crude even before the new measures go into effect in July, to punish Europe, while others say the embargo is a “gift” which will allow the country to diversity its economy.

“Ineffective Western sanctions are not a threat to us, but an opportunity that has brought a lot of benefits,” Moslehi said at a gathering in the central city of Isfahan late Monday.

The measures, approved in Brussels by the EU’s 27 foreign ministers, include an immediate embargo on new contracts for crude oil and petroleum products. Existing contracts with Iran will be allowed to run until July.

Iran's Oil Ministry said the country can find new markets.

Iran can easily find new customers for its oil,” Mohsen Qamsari, a senior ministry official, was quoted by the semiofficial Mehr news agency as saying.

Some 80 percent of Iran’s foreign revenue comes from oil exports, and analysts say that any sanctions affecting its ability to export oil would hit its economy hard. With about 4 million barrels per day, Iran is the second largest producer in OPEC. It exports about 2 million barrels a day and consumes the rest domestically.

The EU has been importing about 450,000 barrels of oil per day from Iran, making up 18 percent of Iran’s oil exports.

Some in Iran said the country should stop selling oil to Europe now, instead of July, to punish the bloc before it can find suppliers to replace Iranian crude oil in the midst of winter.

Associated Press writers Ali Akbar Dareini in Tehran, Iran, Jamey Keaten in Paris and Meera Selva in London contributed to this report