In a show of defiance just days away from Friday's deadline set by the Security Council for Iran to freeze uranium enrichment, Ahmadinejad confidently dismissed any threat of sanctions or even a US attack.

And in his latest vitriolic attack against arch-enemy Israel, the firebrand leader said the "fake" Jewish state "cannot survive" and called on migrants to the country to go back to where they came from.

"They shouldn't think they can baptise a wrong decision with the help of the Security Council," he said of demands that Iran stop enrichment, at the centre of fears that the Islamic regime could acquire nuclear weapons.

Iran says it only wants to enrich uranium to make reactor fuel to generate electricity, as is authorised by the Non-Proliferation Treaty (NPT) -- the cornerstone of efforts to avert the spread of nuclear weapons.

But the Security Council wants a suspension of the work -- which can be extended to make weapons -- pending the completion of a now three year-old and still inconclusive probe by the UN's International Atomic Energy Agency (IAEA).

"Our policy is to work within the NPT and the Agency," Ahmadinejad told a news conference. "But if we see that they don't want to accept our rights, we will reconsider."

The regime's increasingly defiant stance leaves it exposed to the risk of UN sanctions. The United States has also not ruled out the possibility of taking military action against the oil-rich Islamic republic.

At the United Nations in New York, US ambassador John Bolton said the Security Council was to consider a draft resolution that would legally require Iran to comply with demands that it freeze all uranium enrichment activities.

"Our expectation would be that assuming no change of direction by Iran and there's no reason to think there will be a change of direction, we'll look at a 'Chapter 7' resolution to make mandatory all the existing IAEA resolutions," he said.

Chapter 7 of the UN Charter, which is invoked in case of threats to international peace and security, can open the door to sanctions or even military action.

But Ahmadinejad was unmoved by the warnings.

"I see it as unlikely that they would be so unwise to do such a thing," he replied confidently when asked about the impact on Iran's economy if sanctions are imposed.

"Those two or three countries who are so against us have enough sense not to make that mistake. They cannot create limitations for us. They will lose themselves. Our economic infrastructure is strong," he asserted.

"A military attack does not make sense. Besides, our people are powerful and can defend themselves," he argued, before firing off a stiff warning to Washington.

"If they even talk about it, their situation will be very bad ... This is all psychological pressure and propaganda that they use in the form of words in the media to try to make us back down."

Iran's defence minister also warned the United States that it risked a "disgraceful defeat".

"If the US chooses the military option, a disgraceful defeat worse than the failure in Tabas desert awaits them," Mostafa Mohammad Najar said, referring to a failed US attempt to rescue American hostages seized at the US embassy in Tehran after the 1979 Islamic revolution.

In London, British Prime Minister Tony Blair called for the world to send "a signal of strength" to Iran, but insisted "nobody is talking about military invasion".

"So the real thing for me in respect of Iran is what are we going to do about it? All I'm saying is ... it's not advisable at this moment in time to send a signal of weakness. We want to show a signal of strength," Blair said.

Ahmadinejad, who triggered international outrage last year with his call for Israel to be "wiped off the map," also continued his verbal barrage against the Jewish state.

"Logically, this fake regime cannot survive," he said, adding that Jews who have settled in the former Palestine "will return to their motherland".

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