VIENNA/TEHRAN (Reuters) - The U.N. nuclear watchdog ended its latest mission to Iran after talks on Tehran's suspected secret atomic weapons research failed, a setback likely to increase the risk of confrontation with the West. The United States criticized Iran on Wednesday over the failure of the International Atomic Energy Agency's latest mission, saying it again showed Tehran's refusal to ...

TEHRAN — Iran’s supreme leader vowed Wednesday to press ahead with the country’s nuclear energy program, while also reiterating his denials of any intention to produce nuclear weapons. Addressing a group of nuclear scientists, Ayatollah Ali Khamenei said: “The Islamic Republic of Iran, with a thoughtful, jurisprudent, theoretical approach, believes that owning a nuclear weapon is a big sin. It ...

A visit to Iran by UN inspectors probing Iran's suspected nuclear weapons activities failed to achieve a breakthrough, with Tehran denying access to a key military site, the IAEA said Wednesday.

(Reuters) - U.S. and European officials are downplaying allegations that Iran and al Qaeda have recently stepped up cooperation in preparation for possible attacks on U.S. and other Western targets. The officials, who are familiar with security issues, and private experts, discounted recent news reports about a possible new deal between Iran and what remains of al Qaeda's core leadership, now ...

Iran can banish U.N. inspectors from its military sites but it can't obstruct the prying eyes of commercial satellites.

Russia said Wednesday the world should not draw "hasty conclusions" over Iran's most recent rebuff of U.N. attempts to investigate allegations the Islamic Republic hid secret work on atomic arms, but the U.S. and its allies accused Tehran of nuclear defiance.

A U.N. team visiting Iran has no plans to inspect the country's nuclear facilities and will only hold talks with officials in Tehran, Iran's Foreign Ministry spokesman said Tuesday.

A fruitless visit to Iran by UN nuclear inspectors raised tensions on Wednesday, with Russia warning of "catastrophic" consequences if it leads to a military attack on its Middle East ally.

As pressure mounts over Iran's nuclear program, a top Iranian general warned Tuesday that the nation will pre-emptively strike anyone who threatens it.

Key questions about Iran's nuclear program remain unresolved despite two days of talks with UN experts in Tehran about possible weapons efforts.