Iran's announcement that it has begun enriching uranium to the threshold at which it could set off a nuclear reaction drew a sharp rebuke from President Obama on Tuesday.
In what appears to be an attempt to call Iran's bluff on its nuclear program, the United States is poised to offer Tehran a way to obtain medical isotopes that Iran says it desperately needs to treat cancer patients, according to the State Department.
Iran announced plans to begin enriching uranium to 20 percent on Tuesday, a move likely to heighten fears it is moving closer to producing an atomic weapon.
Iran's envoy to the International International Atomic Energy Agency (IAEA) said the window for nuclear negotiations is still open -- even as tensions rise over Iran's decision to defy the world on uranium enrichment.
Iran informed the U.N. nuclear watchdog Monday that it will begin enriching uranium to 20 percent on Tuesday, state-run Press TV reported.
The Senate passed a bill on Thursday that would allow President Obama to expand sanctions against Iran to pressure the Islamic republic to drop its nuclear weapons ambitions.
A nuclear weapons assembly and disassembly plant in Texas was on lockdown Friday morning because of a "potential security situation," according to a news release.
The world has inched further away from doom and nuclear disaster, said a group of respected scientists that includes 19 Nobel Laureates.
The only man recognized as a survivor of both atom bombs dropped in Japan at the end of World War II has died.
Iran will hold a "large-scale military exercise" next month in order to prepare its forces to repel an offensive by the nation's enemies, government-funded Press TV reported, citing a top military official.
Iran's announcement that it has begun enriching uranium to the threshold at which it could set off a nuclear reaction drew a sharp rebuke from President Obama on Tuesday.
In what appears to be an attempt to call Iran's bluff on its nuclear program, the United States is poised to offer Tehran a way to obtain medical isotopes that Iran says it desperately needs to treat cancer patients, according to the State Department.
Iran announced plans to begin enriching uranium to 20 percent on Tuesday, a move likely to heighten fears it is moving closer to producing an atomic weapon.
Iran's envoy to the International International Atomic Energy Agency (IAEA) said the window for nuclear negotiations is still open -- even as tensions rise over Iran's decision to defy the world on uranium enrichment.
Iran informed the U.N. nuclear watchdog Monday that it will begin enriching uranium to 20 percent on Tuesday, state-run Press TV reported.
The Senate passed a bill on Thursday that would allow President Obama to expand sanctions against Iran to pressure the Islamic republic to drop its nuclear weapons ambitions.
A nuclear weapons assembly and disassembly plant in Texas was on lockdown Friday morning because of a "potential security situation," according to a news release.
The world has inched further away from doom and nuclear disaster, said a group of respected scientists that includes 19 Nobel Laureates.
The only man recognized as a survivor of both atom bombs dropped in Japan at the end of World War II has died.
Iran will hold a "large-scale military exercise" next month in order to prepare its forces to repel an offensive by the nation's enemies, government-funded Press TV reported, citing a top military official.
Iran's foreign minister on Saturday issued an ultimatum to the West: Either renegotiate the United Nations-backed deal on Iran's nuclear program, or the Islamic republic will enrich nuclear fuel on its own.
Israeli nuclear whistle-blower Mordechai Vanunu was arrested Tuesday by Israeli police for allegedly violating the terms of his 2004 prison release agreement.
The U.S. point person on North Korea said Wednesday that nation's uranium enrichment program must be dealt with once dormant six-party talks on its nuclear program resume.
A secret document that appears to show that Iran was working on building nuclear weapons as recently as 2007 is "alarming" and "part of a body of evidence backing up deep concerns over Iran's nuclear program," a Western diplomatic source with knowledge of the papers told CNN on Monday.
Iran is ready to give up some enriched uranium in exchange for fuel that would power a reactor used in cancer research, the country's foreign minister said Sunday, according to Iranian media.
When President Obama called for a world free of nuclear weapons in Prague, Czech Republic, this spring, many dismissed this part of his speech as idealistic rhetoric.
The White House warned Iran Tuesday that it faces further sanctions if "they don't stop their enrichment activities, if they don't forsake their nuclear weapons program."
Iran's Cabinet has authorized the construction of another 10 uranium enrichment plants, its state news agency announced Sunday, further defying international calls to halt its production of nuclear fuel.
The United States warned Iran on Friday it is prepared to push for significantly stronger economic sanctions against it in the wake of the U.N nuclear watchdog's resolution censuring Tehran's nuclear program.
The board of the United Nations' nuclear watchdog agency Friday sharply criticized Iran's nuclear activities in a resolution, and urged Iran to immediately suspend construction of its recently disclosed nuclear facility at Qom.
Iran plans to launch a large aerial military exercise Sunday to prepare for any possible attack, state media said.
Representatives of six world powers and the European Union met in Brussels on Friday to discuss Iran's apparent rejection of a key part of a nuclear deal.
United Nations nuclear inspectors Thursday visited an Iranian nuclear plant that was secret until September, the International Atomic Energy Agency told CNN.
Iran will not send its partially enriched uranium abroad to be turned into material for medical research, its foreign minister said Wednesday, rejecting a key plank of a deal designed to ease international fears that Tehran aims to build nuclear weapons.
In a report published Monday, the United Nations nuclear watchdog group says Iran's disclosure of a previously secret nuclear facility near Qom raises questions about the existence of other such facilities.
Russia and the United States are well on their way to reducing their nuclear stockpiles, President Obama and Russian President Dmitry Medvedev said Sunday.
Iran can't convince the world it doesn't want nuclear weapons as long as it is producing nuclear fuel on an industrial scale, former U.N. weapons inspector Hans Blix said Wednesday.
Pakistan angrily defended the security of its nuclear arsenal Sunday after a U.S. magazine reported that the Obama administration wants Pakistan to let Washington help secure its weapons in a crisis.
Iran has sent an "initial response" to a proposal designed to break the deadlock over its nuclear program, the International Atomic Energy Agency said Thursday.
A former Australian foreign minister said Wednesday he was encouraged by exchanges "across the room" between Israeli and Iranian representatives during a meeting both attended last month.
United Nations-backed nuclear inspectors on Sunday visited a newly disclosed Iranian nuclear facility near the city of Qom, Iranian media has reported.
International officials arrived in Iran on Sunday to inspect a newly disclosed nuclear facility near the city of Qom, state media reported.
Iran said Friday it needs more time to decide whether to sign onto a deal that could help end the international showdown over its nuclear activities.
Iran has accepted a draft agreement that calls for some uranium produced in Iran to be sent abroad for further enrichment, an Iranian diplomat said Wednesday.
Secretary of State Hillary Clinton will deliver an address on arms control and international security at the U.S. Institute of Peace Wednesday.
The chief of the United Nations' nuclear watchdog agency sounded less optimistic after Tuesday's meeting on Iran's nuclear program than he had after Monday's meetings.
Nearly nine in 10 Americans say they think Iran is trying to develop nuclear weapons, according to a new national poll.
The first day of meetings on the future of Iran's nuclear program ended Monday on a note of optimism from the director-general of the U.N.'s nuclear watchdog agency.
North Korean leader Kim Jong Il has again indicated willingness to participate in bilateral talks with the United States and return to six-party talks over its nuclear program, China's Xinhua news agency reported.
United Nations inspectors will visit Iran's recently disclosed nuclear power plant on October 25, the head of the International Atomic Energy Agency announced Sunday from Tehran, Iran.
The United States and its partners in the P5+1 -- Britain, France, Germany, Russia and China -- left Thursday's talks with Iran in Geneva, Switzerland, rightfully claiming progress.
Days after Iran revealed the existence of a second uranium enrichment facility, the head of the United Nations' nuclear watchdog agency paid the country a visit.
U.S. President Barack Obama called on Iran to provide the U.N. nuclear watchdog agency with "unfettered" access to the newly disclosed Qom uranium enrichment site, and Tehran's nuclear negotiator said the country would cooperate with inspectors.
Iran broke international law by not disclosing sooner its recently revealed uranium enrichment site, the head of the United Nation's nuclear watchdog agency said.
Iran will soon tell the International Atomic Energy Agency when it can inspect the Islamic republic's recently revealed nuclear facility, the country's state-run Press TV reported.
Days before a key meeting with Western leaders, Iran test-fired two types of long-range missiles Monday in part of what the Islamic republic called routine military exercises, its state-run media reported.
The United States wants Iran to provide international inspectors with full access to a newly disclosed underground uranium enrichment plant that Obama administration officials say is both illegal and probably intended for developing weapons.
The head of Iran's Atomic Energy Organization said Saturday that U.N. nuclear experts can inspect a uranium enrichment plant, according to a report from Iran-funded Press TV.
President Obama's accusations that Iran's nuclear program runs afoul of international agreements are "baseless," the Islamic republic's president told CNN's Larry King on Friday.
Iran's admission that it is building a second uranium enrichment plant and the West's blunt condemnation of the project will probably place the Islamic republic in a diplomatic corner, analysts say.
A rare meeting of U.N. Security Council heads of state, led for the first time by a U.S. president, adopted a resolution focused on stopping the spread of nuclear weapons Thursday.
Russian President Dmitry Medvedev met Wednesday with U.S. President Barack Obama, then signaled he could support sanctions against Iran over its efforts to develop a nuclear weapon.
Britain is examining the possibility of scaling back its Trident nuclear deterrent program by cutting the number of missile-carrying submarines from four to three, Prime Minister Gordon Brown said Wednesday.
An online news organization has published what it said is a copy of Iran's proposals to the United Nations which were supposed to address international concerns about its nuclear program.
Iran on Wednesday submitted its latest package of proposals to the United Nations Security Council's five permanent members, plus Germany, according to Iran's government-funded Press TV.
North Korea's state-run news agency said Thursday that the country has sent a letter to the United Nations announcing that "reprocessing of spent fuel rods is at its final phase and extracted plutonium is being weaponized."
International officials on Wednesday explored Iran's willingness to enter into negotiations over its nuclear program, and a top-level German negotiator expects the Islamic republic to re-enter talks soon.
Iran has "prepared an updated nuclear package" and is ready to hold talks with world powers, the country's state-run Press TV reported Tuesday.
Iran has limited time to return to international talks on its nuclear program before it faces stiffer sanctions, German Chancellor Angela Merkel told reporters.
International inspectors have made new visits to two of Iran's nuclear facilities, including a research reactor that the U.N.'s watchdog agency has been kept out of for a year, a source familiar with Iran's International Atomic Energy Agency file said Thursday.
Israel makes no secret that it sees Iran is its biggest threat but the scale of the threat is less clear cut.
Below is a chronology of the development of North Korea's nuclear weapons program.
North Korea launched a scathing personal attack on U.S. Secretary of State Hillary Clinton on Thursday after she likened the leadership in Pyongyang to "small children and unruly teenagers and people who are demanding attention."
The United States is "absolutely not" giving Israel a green light to attack Iran, U.S. President Barack Obama told CNN Tuesday.
The test of a nuclear device on May 25 and the subsequent test missile-launches by North Korea have jolted the international community into universal condemnation of such flagrant violations of the relevant United Nations resolutions. Even China, North Korea's traditional ally, has expressed unprecedented firm opposition to such violations and has joined the United Nations Security Council in its resolution condemning such violations.
The United Nations nuclear watchdog agency elected Yukiya Amano as its new director general Thursday, it announced.
The head of the U.N. nuclear watchdog agency says it's his "gut feeling that Iran definitely would like to have the technology" enabling it to possess nuclear weapons.
Allowing North Korea to develop nuclear weapons would destabilize Asia and threaten the world, President Obama said Tuesday after meeting with South Korean President Lee Myung-bak.
The U.S. intelligence community believes that North Korea tested a nuclear device last month with an explosive yield of several kilotons, considerably more powerful than its first test nearly three years ago.
North Korea said Saturday it would strengthen its nuclear capabilities, a defiant protest against the U.N. Security Council's move to tighten sanctions against it.
The U.N. Security Council voted unanimously Friday to expand and tighten sanctions on North Korea after that nation's recent nuclear test.
North Korea may be preparing for a new atomic bomb test a month after its last test, a U.S. official said Thursday.
Regardless of who wins the Iranian election, continuity will be the hallmark of Iran's foreign affairs and nuclear program.
North Korea has test-fired a short-range missile off the country's east coast, a South Korean military source said Friday.
The United States will not accept North Korea as a nuclear-armed state, Defense Secretary Robert Gates said Saturday at an international conference.
U.S. satellite imagery has spotted "vehicle activity" at a North Korean ballistic missile site, two Defense Department officials said Friday.
South Korean and U.S. forces have been placed on a higher surveillance alert level, after North Korea threatened military action following its nuclear test earlier this week, the joint forces announced on Thursday.
North Korea has fired another short-range missile, the South Korean Yonhap News Agency reported on Wednesday.
South Korea formally announced Tuesday that it would join a U.S.-led effort to crack down on trafficking in weapons of mass destruction in response to North Korea's new nuclear test.
South Korea's government on Monday reacted harshly to Pyongyang's latest nuclear test.
President Obama castigated the North Korean government Monday for conducting a second nuclear bomb test in defiance of multiple international warnings.
President Obama on Thursday sent a civil nuclear agreement with the United Arab Emirates to the Senate for ratification, but its passage remains uncertain, thanks to a recently disclosed video.
Russian and U.S officials are meeting Wednesday and Thursday in Moscow to discuss a replacement pact for the Strategic Arms Reduction Treaty I, which is expiring in December.
Israeli Prime Minister Benjamin Netanyahu reiterated his concern over the potential of a nuclear-armed Iran during meetings with top congressional leaders Tuesday.
President Obama and Israeli Prime Minister Benjamin Netanyahu on Monday held their first face-to-face meeting since each took power, confronting a range of potentially divisive issues.
A U.S. Senate report released Thursday says some experts predict Iran could have enough material for a nuclear bomb in six months.
North Korea threatened to conduct a nuclear test and more ballistic missile tests if the U.N. Security Council doesn't withdraw its condemnation of Pyongyang's rocket launch earlier this month, the state-run Korean Central News Agency reported.
Taliban militants made their deepest incursion into Pakistan this week, seizing control of areas that are a short drive from the capital city.
As U.S. nuclear experts prepared to leave North Korea, the United States vowed consequences on Pyongyang for expelling them, along with U.N. nuclear inspectors. This is after the United Nations condemned North Korea's recent missile launch.
One of the main stumbling blocks to talk with Iran has been the condition that Iran suspends its uranium enrichment. Now, the Obama administration may take that option off the table, at least for now.
Iranian President Mahmoud Ahmadinejad said his country could be proud of two major nuclear accomplishments.
In a dramatic break from previous policy, the United States will join direct talks between U.N. and European powers and Iran over Tehran's nuclear program, the State Department announced Wednesday.
After a three-hour emergency session Sunday, the United Nations Security Council failed to come to any agreement on how to deal with North Korea's rocket launch over the weekend.
North Korea's thinly disguised missile test violates U.N. resolutions and should be condemned. But it is not a serious threat to the United States, nor does it justify a crash program to deploy an expensive, unproven anti-missile system.
President Obama urged nations Sunday to get rid of nuclear weapons, saying that the U.S. is committed to reducing nuclear stocks within the next four years.
The United States, Japan and South Korea can only wait and see what North Korea has up its sleeve.
North Korea says it will attack the Japanese military and "major targets," if Japan shoots down a rocket Pyongyang plans to launch in the coming days, North Korea's state-run news service, KCNA, reported Thursday.
President Barack Obama reached out to Iran on Friday -- the start of the Iranian New Year -- in a video message offering "the promise of a new beginning" that is "grounded in mutual respect."
Findings in a recent U.N. report that Iran's nuclear program "has military dimensions" are "troubling," the U.S. ambassador to the United Nations said Tuesday.
President Obama said Tuesday that reports of a U.S. offer to kill a proposed missile defense system in exchange for Russian assistance in preventing Iran's acquisition of nuclear weapons were inaccurate.
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