Nuclear Weapon | featured news

South Korean officials have detected "brisk" activity at a North Korean nuclear test site, a news report said Thursday, days after the communist country threatened to conduct nuclear and missile tests.

Pakistan's nuclear weapons are secure, the top US military chief Adm. Michael Mullen said Monday, ruling out that they could fall into the hands of Taliban militants.

Iran will not suspend its disputed nuclear program even if the United States imposes sanctions targeting companies that ship fuel to the Islamic Republic, a Foreign Ministry spokesman said Monday.

A Pakistani military offensive against insurgent hideouts prompted suspension of controversial peace talks with the Taliban on Monday, and the country's president sought additional foreign aid to ensure that its nuclear arms remain in "safe hands."

North Korea has restarted its nuclear facilities to harvest weapons-grade plutonium, an official said Saturday, in an escalation of the communist state's standoff with the international community over its nuclear and missile programs.

U.S. monitors of North Korea's nuclear program left the communist nation Friday after the regime ordered them out and vowed to restart its reactor in anger over U.N. criticism of its rocket launch.

Russia's foreign minister will visit North Korea next week, a source said on Friday, as regional powers try to prevent the state from restarting its nuclear arms plant and defuse tensions that have rattled regional security.

Russia and the United States will pursue a new deal to cut nuclear warheads, presidents Dmitry Medvedev and Barack Obama said on Wednesday, making good on a pledge to rebuild relations from a post-Cold War low.

Iran has no weapons-grade uranium, US officials say, contradicting earlier American and Israeli reports.

President Obama has told Russia that the United States might not proceed with a missile defense system in eastern Europe if Iran drops plans for producing nuclear weapons, senior administration officials said Tuesday.