There would also be sanctions against states leaving the treaty to develop nuclear weapons.
The Obama administration consistently says that Iran should not be allowed to develop nuclear weapons.
International powers suspect Iran of seeking to develop nuclear weapons - a charge Iran strongly denies.
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Countries such as Iran could use the situation to develop nuclear weapons, he added.
Vice President Joe Biden earlier this week forcefully admonished any attempts by Iran to develop nuclear weapons.
Iran says its nuclear programme is peaceful, but critics suspect it of seeking to develop nuclear weapons.
The new NIE of 2007 did not quote know whether Iran currently intends to develop nuclear weapons.
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Iran denies it is seeking to develop nuclear weapons and insists its nuclear programme is solely for peaceful purposes.
Today Iran exploits its status as an NPT signatory to develop nuclear weapons.
Israel, along with Western and other powers, has accused Iran of seeking to develop nuclear weapons, a charge Iran denies.
The United States also claims, against strong Iranian denials, that Iran is seeking to develop nuclear weapons and long-range missile technology.
Tehran insists its nuclear activities are for solely peaceful purposes, but Western powers fear Iran is seeking to develop nuclear weapons.
Khan is widely regarded as a hero in Pakistan for his part in helping the country to develop nuclear weapons.
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Western governments are trying to tighten the screws on Iran amid growing concern that the country is trying to develop nuclear weapons.
The United States and some European countries say Iran is trying to develop nuclear weapons, which is what they want to stop.
President Barack Obama said last month that Iran was "over a year or so" from being able to develop nuclear weapons.
She noted that there are still concerns that North Korea was also seeking to develop nuclear weapons through the enrichment of uranium.
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Mr. STEPHEN HADLEY (National Security Advisor): It confirms that we were right to be worried about Iran seeking to develop nuclear weapons.
Iran and North Korea are already in violation of the Nonproliferation Treaty (NPT), which requires that they do not develop nuclear weapons.
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They suspect Iran is seeking to develop nuclear weapons, something it denies.
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The United States benefitted both during World War II and during the cold war in being the nation to develop nuclear weapons first.
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One might question why the United States, alone, should be involved in every single case of counties that wish to develop nuclear weapons.
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And if I had to sum it up in one sentence, it is this: Iran must not be allowed to develop nuclear weapons.
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In brief, whereas the NIE of 2005 had assessed with high confidence--and I'm quoting--that Iran currently is determined to develop nuclear weapons, closed quote.
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Behind the IAEA visit, there is the wider issue of what to do if a country is suspected of trying to develop nuclear weapons secretly.
Along with the West, it suspects Iran of trying to develop nuclear weapons under the guise of a civilian nuclear programme, a claim Tehran denies.
He has also taken a hard line towards Iran, repeatedly warning of the danger to the international community of allowing it to develop nuclear weapons.
Tensions over Tehran's alleged attempts to develop nuclear weapons have led to Iran halting oil exports to the UK and France in retaliation for European Union sanctions.
Chavez spoke about his aspirations to develop nuclear weapons "for peaceful purposes" and his intention to seek cooperation with Latin American countries and Iran in this regard.
The good news on the Iraq front does not in any way diminish the magnitude of the impending showdown with Iran over its efforts to develop nuclear weapons.
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