Senior U.N. inspectors arrived in Iran on Monday to push for transparency about its disputed nuclear program and several European states halted purchases of Iranian oil as part of Western moves to pile pressure on a defiant Tehran.
Meanwhile, a semiofficial Iranian news agency reported that Tehran was considering extending an oil embargo on France and Britain to other countries.
The head of Iran's state oil company Ahmad Qalehbani was quoted by Mehr as saying that the country would stop selling crude to nations who take action against Tehran.
"If the hostile acts of some other European countries continue, oil exports to these countries will be cut," he said.
Negotiations?
Iran denies Western allegations that it is covertly seeking the means to build nuclear weapons and has again vowed no nuclear retreat in recent weeks, but also voiced willingness to resume negotiations with world powers without preconditions.
The five-member International Atomic Energy Agency team, led by chief IAEA inspector Herman Nackaerts, planned two days of meetings in another attempt to get answers from Iran regarding intelligence suggesting it is trying to develop atomic bombs behind the facade of a declared civilian nuclear program.

Nackaerts said on departure from Vienna that he wanted "concrete results" from the talks. His delegation was expected to seek, among other things, to question Iranian nuclear scientists and visit the Parchin military base believed to have been used for high-explosive tests relevant to nuclear warheads.
But Foreign Minister Ali Akbar Salehi dampened speculation about increased IAEA access when he told the student news agency ISNA that the agency officials would not be going to any nuclear sites. "No. Their work has just begun," Salehi said. Diplomats doubted that the talks would bring a breakthrough.
"I believe most are rather skeptical concerning the outcome because, well, Iran had a chance at the last meeting and didn't seize it," a senior Western official said, referring to the last trip by the senior IAEA team to Tehran at the end of January.
Referring to last week's announcements by Iran of new nuclear advances, he said: "They send out the wrong signals that Iran is really willing to cooperate... We will wait and see what will come out of this meeting but we should be prepared that Iran might try some technical steps ... to appear cooperative without really providing the necessary cooperation."
The outcome of the discussions will have diplomatic repercussions because it could either deepen a stand-off that has stoked fears of war or provide scope to reduce tensions.
In a sign of Iranian concern about possible, last-resort air strikes by arch-enemies Israel or the United States, Tehran on Monday began a four-day military exercise in protecting its nuclear sites, according to Iranian media.
"(It) will practice coordination between the Revolutionary Guards and regular army and air defense units in establishing a defense umbrella over our vital centers, particularly nuclear facilities," the labor news agency ILNA said.
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The European Union enraged Tehran last month when it decided to slap a boycott on its oil from July 1. On Monday, the European Commission said Belgium, the Czech Republic and the Netherlands had already stopped buying Iranian oil, while Greece, Spain and Italy were cutting back on their purchases.
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In retaliation for oil sanctions, Iran, the world's fifth-largest crude exporter, has threatened to close the Strait of Hormuz, conduit for a third of the world's seaborn oil, and the United States signaled it would use force to keep it open.
On Sunday, Iran's oil ministry announced a retaliatory halt in oil sales to French and British companies, although that step will be largely symbolic as those firms had already greatly reduced purchases of Iranian crude.
Rising oil prices
The spiking tension has put upward pressure on oil prices.
Deputy Oil Minister Ahmad Qalebani suggested the Western crackdown would backfire, saying that in targeting Iranian oil the West had achieved only a surge in crude prices from $103 a barrel to $120, "and it will reach $150."
In remarks carried by the official news agency IRNA on Monday, Qalebani also said that if other EU states continued "their hostile behavior towards Iran, we will cut our oil exports to those countries ... Fortunately demand for Iran's crude has not decreased. Instead it has increased."
But the EU could cope with an abrupt halt by Iran of its oil exports as buyers of Iranian oil are already adjusting to the EU's forthcoming ban on Iranian shipments, an International Energy Agency (IEA) official said on Monday.
China, in rare criticism of one of its major oil suppliers, rebuked Iran over the move to bar sales to Britain and France.
"We have consistently upheld dialogue and negotiation as the way to resolve disputes between countries, and do not approve of exerting pressure or using confrontation to resolve issues," Foreign Ministry spokesman Hong Lei told a news briefing when asked about the matter.














