All Blog Posts from World Watch

Iran has experimented with a nuclear warhead design so advanced, it's still a secret in both the U.S. and Britain, according to a report in Friday's Guardian.

The British newspaper reports that intelligence suggesting the isolated Islamic regime tested components of a "two-point implosion" warhead has been handed over to Iran by the U.N. nuclear watchdog as part of a dossier of matters requiring explanation.

Parts of the International Atomic Energy Agency's dossier has been published in the past, but this is the first claim that Iran has sought such advanced weaponry — a claim nuclear experts called "breathtaking" when asked by the Guardian.

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This story was filed by CBS News correspondent Elizabeth Palmer in Vienna. CBSNews.com's Tucker Reals in London contributed to the report.

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Updated, 7:59 a.m. Eastern:

Diplomats from Iran, the U.S., Russia and France agreed Wednesday to a draft proposal that would see Iran ship about 75 percent of it's enriched uranium to Russia by the end of this year.

Each nation's government will still need to ratify the agreement individually by Friday, and it's unclear whether Iran's hard-line rulers intend to do so.

Iran's envoy was upbeat following the morning talks. Lead negotiator Ali Asghar Soltanieh told reporters upon emerging from the closed door meetings that a side deal attached to the proposal includes an historic first: a proposed direct transfer of U.S. nuclear technology to Iran, including "control, instrument and safety equipment" for the research reactor at Tehran University.

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This story was filed by CBS News correspondent Elizabeth Palmer in Vienna.

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Senior diplomats from the U.S., Iran, France and Russia missed a noon deadline Tuesday to start talks aimed at hammering out a historic deal on Iran's uranium stockpile.

At first, the negotiations at the International Atomic Energy Agency in Vienna, Austria seemed to hold real promise. After the introductory round of talks late Monday, a senior U.S. official said the Iranians had "engaged constructively".

Officials said Iran forced Tuesday's delay by suddenly announcing that France should be excluded from the talks — apparently the latest twist in a long-running business dispute.

Diplomats are now wondering whether Iran's last-minute objections to France's presence at the table in Vienna are in fact a thinly disguised attempt to derail the whole process.

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Iran has rejected claims by America's top military officer that the Islamic Republic now has enough raw material to make a nuclear bomb.

Foreign Ministry spokesman Hasan Ghashghavi said Monday that any person familiar with nuclear issues would understand the comments by Chairman of the Joint Chiefs of Staff Adm. Mike Mullen were false.

"These comments are just propaganda, not true or scientific. Of course, Mr. Gates immediately corrected this U.S. official's remarks," said Ghashghavi.

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