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The article discusses uncertainty surrounding the hundreds of sites in the U.S. where research on nuclear weapons and atomic energy took place during the 1940s. At some locations including a building at the University of California at Berkeley, nuclear residue has persisted for decades. The U.S. government lacks the addresses for dozens of sites, and the Energy Department does not always have sufficient documentation to determine whether a site needs decontamination.

The article states that international organization the United Nations (U.N.) watchdog group the International Atomic Energy Agency (IAEA) was expected to certify that the Iranian government had met its commitments as part of the July 2015 Iranian nuclear weapons agreement on January 16, 2016.

The article states that the North Korean government's January 2016 claim to have detonated a hydrogen bomb posed a challenge to U.S. president Barack Obama's diplomatic efforts in Asia. According to the article, the Obama administration disputed North Korea's claims of detonating a bomb. The article details efforts by Obama to coordinate an international response to North Korea's claims.

The article states that North Korean state television announced that the North Korean government successfully detonated a hydrogen bomb (H-Bomb) in early January 2016. It also states that the U.S. agency the State Department claimed that the U.S. government could not confirm North Korea's claims, and that the South Korean government pointed to the test as a violation of the international group the United Nations Security Council ban on North Korea's development of nuclear weapons.

The article states that several members of the U.S. Congress criticized the administration of U.S. president Barack Obama for delays in economic sanctions against Iran concerning Iran's nuclear missile program as of early January 2016. According to the article, U.S. secretary of state John Kerry and Iranian foreign minister Javad Zarif were discussing the sanctions.

The article states that the administration of U.S. Barack Obama was set to impose financial sanctions on Iran as of the end of 2015 for the first time since a nuclear accord in July 2015. According to the article, the U.S. government agency the Treasury Department planned sanctions against several companies and individuals in response to their alleged part in developing Iran's ballistic-missile program. The article states that Iranian officials told the Obama administration that any penalties would be seen by Iran Supreme Leader Ayatollah Ali Khamenei as a violation of the accord.

The article states that the administration of U.S. president Barack Obama utilized the U.S. government bureau the National Security Agency (NSA) to spy on U.S. allies, particularly Israel and Israeli prime minister Benjamin Netanyahu during the U.S. pursuit of a nuclear arms agreement with Iran. The article also discusses NSA surveillance of top aides of leaders such as German chancellor Angela Merkel, French president François Hollande, and leaders of the group the North Atlantic Treaty Organization (NATO).

The article states that several large U.S. corporations including personal-computer firm HP Inc. and the oil-services unit of the conglomerate General Electric Inc. (GE) were actively exploring entering the economic market of Iran ahead of the potential January 2016 expiration of economic sanctions against Iran. According to the article, sanctions relief for the Iranian government could begin when an international agreement concerning Iran's nuclear program is implemented.

The article states that the administration of U.S. president Barack Obama announced in early December 2015 that it anticipated lifting economic sanctions against Iran as early as January 2016. According to the article, the announcement followed the publication of a report by the organization the United Nations (UN) nuclear watchdog the International Atomic Energy Agency (IAEA) indicating that Iran had not engaged in atomic-weapons activity as of late. The article also states that the IAEA report said that Iran had secretly pursued a nuclear program until 2009.

The article discusses the difficulties facing the U.S. government agency the Department of Energy in attempting to clean up various sites contaminated by the U.S. nuclear weapons program while dealing with significant budget constraints and rising cost estimates. According to the article, the U.S. Congress and government overseers were warning of health risks associated with nuclear stockpiles in contaminated buildings, though provisions directing the executive branch to address them were vetoed by U.S. president Barack Obama in Congress's 2016 defense bill.

The article discusses mutual distrust and espionage between the U.S. and Israel during the early 21st century, particularly pertaining to a disagreement and split concerning how best to prevent Iran from obtaining an atomic bomb. It details personal strain between U.S. president Barack Obama and Israeli prime minister Benjamin Netanyahu, the Obama administration's preference for a diplomatic resolution to Iran's nuclear program, and Israel's willingness for covert action to destroy Iran's nuclear program.

The article states that the administration of U.S. president Barack Obama won a significant foreign-policy victory following a September 10, 2015, procedural vote in the U.S. Senate that would spare Obama from vetoing a rejection of an international accord concerning Iran's nuclear weapons program that was agreed to on July 14, 2015. According to the article, all U.S. congressional members of the U.S. political party the Republican Party and some in the U.S. political party the Democratic Party opposed the accord.

The article states that former U.S. secretary of state Hillary Clinton shifted U.S. policy toward Iran by permitting Iran to continue to enrich uranium at small levels during her last months in office in an effort to attempt to continue diplomatic efforts concerning Iran's nuclear weapons program. According to the article, Clinton, a 2016 U.S. presidential candidate, was scheduled to deliver an address supporting the 2015 international accord with Iran on September 9, 2015. The article presents comments from Clinton aide Jake Sullivan.

The article discusses efforts by Israeli prime minister Benjamin Netanyahu to convince members of the U.S. Congress to oppose an international accord with Iran supported and advanced by the administration of U.S. president Barack Obama, and tension between the U.S. and Israeli governments. The article discusses an August 2015 meeting between Netanyahu and U.S. lawmakers from the U.S. political party the Democratic Party and accusations that the Israeli effort breached protocol. The article presents comments from Harvard University Kennedy School of Government scholar Daniel Harsha.

The article states that U.S. president Barack Obama secured enough support in the U.S. Senate among the caucus of senators in the Democratic Party to implement an international accord reached with Iran concerning its nuclear weapons program. According to the article, U.S. senator Barbara Mikulski endorsed the agreement on September 2, 2015, that would sustain a promised Obama veto of a possible congressional resolution rejecting the agreement. The article also discusses the significance of the nuclear agreement in the 2016 U.S. presidential election.

The article states that a report provided to the U.S. Congress from the administration of U.S. president Barack Obama concerning the July 14, 2015, agreement with Iran concerning its nuclear weapons program stated that Iran was unlikely to admit having pursued a secret nuclear weapons program. According to the article, the admission could be a significant point of debate between members of Congress and the administration. The article states that Iran has until mid-October 2015 to provide inspectors from the organization the United Nations (UN) access to nuclear weapons information.

The article states that the administration of U.S. president Barack Obama was attempting to assuage fears of allies such as Israel and Saudi Arabia concerning the international nuclear agreement with Iran made in mid-2015 that would lift sanctions on Iran imposed by the organization the United Nations (UN) concerning arms and ballistic missile technology. The article discusses U.S. plans to assist in the development of regional ballistic missile defense systems. According to the article, U.S. secretary of defense Ash Carter was due to visit Israel and Saudi Arabia in July 2015.

The article examines political and diplomatic discord that immediately followed the announcement of an agreement between Iran and six world powers in Vienna, Austria, concerning the cessation of Iran's nuclear weapons program on July 14, 2015. According to the article, Israeli prime minister Benjamin Netanyahu and U.S. Senate Foreign Relations Committee chairman Bob Corker criticized the agreement, while Iranian president Hassan Rouhani and Russian president Vladimir Putin praised it. The article discusses U.S. president Barack Obama's challenges in promoting the accord. INSET: What the Two Sides Agreed.

The article states that U.S. secretary John Kerry, Iranian foreign minister Javad Zarif, and foreign ministers from China, Russia, France, Great Britain, and Germany were prepared to sign a nuclear weapons accord on July 14, 2015. According to the article, the agreement seeks to impede Iran's development of a nuclear weapon in exchange for removing economic sanctions imposed by the organization the United Nations (UN) on Iran. The article discusses the significance of the agreement to the administration of U.S. president Barack Obama.

The article discusses secret meetings between Iran and the U.S. that were largely facilitated by Oman that led to direct talks between Iran and the U.S. concerning Iran's nuclear weapons program during the early 21st century. According to the article, Iran presented a list of prisoners it wanted released from U.S. custody to U.S. president Barack Obama. The article discusses Obama's communications with Iranian Supreme Leader Ayatollah Ali Khamenei, and Oman envoy Salem ben Nasser al Ismaily.

The article states that several Chinese nuclear experts claimed that North Korea's nuclear weapons production was higher than previous U.S. statistics showed during a meeting with U.S. nuclear specialists in April 2015. According to the article, North Korea may have 20 nuclear warheads in addition to the capability of producing the necessary uranium to double its nuclear arsenal by 2016. The article discusses security concerns in Japan and South Korea and U.S. security treaties with those nations.

The article reports that leading U.S. Senators reached an agreement with President Barack Obama on Congressional review of any deal the U.S. may enter into that scales back Iran's nuclear program. A bill written by Senator Bob Corker will be modified to bar Obama from lifting sanctions against Iran during a 30-day review period. Obama's administration would also have to confirm to Congress that Iran is in compliance with the accord every 90 days.

The article discusses comments from Iran's Ayatollah Ali Khamenei about a framework agreed to with Western negotiators including the U.S. aimed at curtaining Iran's nuclear program. Khamenei said any deal would have to include an immediate lifting of all economic sanctions against Iran and could not allow for inspections of Iran's military sites. U.S. State Department spokesman Jeff Rathke suggested neither demand could be assented to.

The article discusses reaction to a deal aimed at curbing Iran’s nuclear program that is supported by the administration of U.S. President Barack Obama. Israeli officials including intelligence chief Yuval Steinitz have voiced their opposition to the agreement. U.S. Senator Mitch McConnell was similarly critical. Saudi Arabian ambassador Adel al-Jubeir said his country needed to learn more about the proposed framework.

The article discusses challenges facing U.S. President Barack Obama as he seeks support in Congress for an agreement negotiated with Iran to curtail that nation's nuclear program. Senator Bob Corker has introduced legislation that would bar Obama from lifting sanctions against Iran for 60 days. Senator Lindsey Graham has criticized the deal and says Congress will demand the right of approval.

The article discusses concerns among Jewish leaders in the U.S. about a deal to curtail Iran's nuclear program negotiated in part by the administration of U.S. President Barack Obama. Jewish members of Congress have told Obama's chief of staff, Denis McDonough, their support for the pact will require that Obama work to conciliate Jews. Rabbi Howard Buechler says Obama's strained relations with Israel have similarly strained U.S. Jews' traditional support for the Democratic Party.

The article reports that international negotiators have reached agreement on a framework for curtailing Iran's nuclear program. It remained unclear when economic sanctions against Iran would be lifted, and what the permissible scope of Iran's nuclear activities would be after the first 10 years of the pact. U.S. President Barack Obama praised the deal while Israeli Prime Minister Benjamin Netanyahu said it threatened his country's existence.

The article discusses negotiations leading up to an April 2, 2015 agreement on a framework for curtailing Iran's nuclear program. Compromise proved essential. U.S. negotiators realized early that Iran would never consent to completely dismantling the program. Iran eventually agreed to reduce the number of centrifuges it has. Key participants in the talks included Iranian Foreign Minister Javad Zarif and U.S. Secretary of State John Kerry.

The article discusses international talks aimed at curbing Iran's nuclear program. Unresolved issues include the timing for removing sanctions against Iran and the scope of that country's permissible nuclear activities. U.S. President Barack Obama's administration is considering its options in the event the talks fail to reach an agreement. U.S. Senators John McCain and Lindsey Graham said the negotiations would not mitigate the threat posed by Iran to the Middle East.

The article discusses international talks aimed at curbing Iran' nuclear program. Although the March 31, 2015 deadline passed without an accord, U.S. State Department official Marie Harf and Iranian Foreign Minister Javad Zarif both indicated the talks would continue. Two obstacles to a deal were said to be the timing for removing sanctions against Iran, and what nuclear work on the part of Iran would be permissible under an agreement.

The article discusses the importance of Iranian Supreme Leader Ayatollah Ali Khamenei to international negotiations aimed at curbing Iran's nuclear program. Khamenei has insisted that any deal include the immediate end to sanctions on Iran, a development Western negotiators say is not feasible. Iranian Foreign Minister Javad Zarif denies there is a lack of unity among Iran's leadership concerning the talks.

The article discusses efforts by the administration of U.S. President Barack Obama to generate public and Congressional support for a potential deal with Iran to contain that country's nuclear-weapons program. The administration has suggested it might be willing to permit Congress to have a degree of oversight over any agreement. It has also urged its liberal allies to frame the issue as a choice between diplomacy and war.

The article discusses Israeli spying on Western negotiations with Iran about its nuclear program. The administration of U.S. President Barack Obama is angry that Israeli Prime Minister Benjamin Netanyahu and ambassador to the U.S. Ron Dermer used confidential information so gleaned in its efforts to persuade members of the U.S. Congress to oppose any nuclear agreement, efforts that included a speech before Congress by Netanyahu that alienated some Democrats including Senator Dianne Feinstein..

The article discusses a letter sent to Iran's political leadership by U.S. Senator Tom Cotton and 46 of his Republican colleagues in the Senate. The missive warned that any deal on Iran's nuclear program negotiated with U.S. President Barack Obama's administration that was not approved by Congress could be undone once Obama leaves office. Obama accused the Republicans of aligning themselves with elements in Iran opposed to a nuclear deal.

The article considers Israeli Prime Minister Benjamin Netanyahu's speech before the U.S. Congress on March 3, 2014. It is seen as an effort by Netanyahu to bypass U.S. President Barack Obama and use Congress to influence a pact being negotiated with Iran about the latter's nuclear program. U.S. Senator Mitch McConnell spoke in support of a bill requiring Congressional approval of any deal with Iran. Senator Chris Murphy said such a measure was unnecessary.

The article discusses Israeli Prime Minister Benjamin Netanyahu's speech before the U.S. Congress on March 3, 2014. He assailed an agreement the U.S. was negotiating on Iran's nuclear program as a bad deal and said the goal of talks should be to dismantle that program entirely. U.S. President Barack Obama said Netanyahu had offered no alternative proposals and urged people to withhold judgment until an actual pact with Iran was reached.

The article discusses commentary from U.S. and Israeli officials in advance of Israeli Prime Minister Benjamin Netanyahu's speech before the U.S. Congress on March 3, 2015. Netanyahu said the two countries differed on how best to prevent Iran from developing nuclear weapons. U.S. National Security Advisor said a goal of completely dismantling Iran's nuclear program was not feasible. U.S. Secretary of State John Kerry warned Netanyahu not to disclose details of U.S. negotiations with Iran.

The article discusses discord in the relationship between the U.S. and Israel. In March 2015 Israeli Prime Minister Benjamin Netanyahu will address the U.S. Congress despite reservations on the part of U.S. President Barack Obama. Pro-Israeli lobbying group the American Israeli Public Affairs Committee said it would try to influence U.S. relations with Iran through the U.S. Congress. At issue are U.S. negotiations with Iran over the latter's nuclear program.

The article discusses sharp differences between Israeli Prime Minister Benjamin Netanyahu and the administration of U.S. President Barack Obama over negotiations concerning Iran's nuclear program. U.S. officials believe Netanyahu is opposed to making any deal with Iran, while Netanyahu maintains an agreement under consideration would not prevent Iran from developing nuclear weapons. U.S. National Security Adviser Susan Rice termed destructive Netanyahu's planned address before the U.S. Congress.

The article reports that in negotiations about Iran's nuclear program the U.S. and Iran are considering a deal that would halt certain aspects of Iran's nuclear development for 10 years. U.S. Senator Bob Corker is among critics who say a 10-year agreement would be inadequate. Israeli Intelligence Minister Yuval Steinitz said such a deal would put at risk the futures of the U.S. and Israel.

The article discusses epistolary communications between U.S. President Barack Obama and Iranian Supreme Leader Ayatollah Ali Khamenei. In early 2014 Khamenei reportedly responded to a letter Obama sent him in October 2014 that discussed possible cooperation in fighting the Islamic State terrorist group, assuming the U.S. and Iran could reach a deal on the latter's nuclear program. Khamanei is said to have been ambiguous in his reply.

The article discusses controversy in Iran's parliament over that country's negotiations with the U.S. and other nations concerning Iran's nuclear program. Some conservative parliamentarians including Ali Taheri and Hamid Rasaee are adamantly opposed to the talks or to any cooperation with the U.S. It is noted that Ayatollah Ali Khamenei ultimately wields final influence in Iranian foreign affairs.

The article discusses disagreement between U.S. President Barack Obama and Congress over Iran. Robert Menendez is among senators who want to pass a bill imposing further sanctions on Iran if a deadline for negotiating an agreement to curb Iran's nuclear program is not met. Obama wants Congress to hold off on such legislation. House of Representatives Speaker John Boehner has invited Israeli Prime Minister Benjamin Netanyahu to address Congress on the threat posed by Iran.

The article reports that U.S. President Barack Obama said he would veto legislation drafted by Senators Mark Kirk and Robert Menendez to impose additional sanctions on Iran. In an appearance alongside British Prime Minister David Cameron, Obama urged Congress to hold off on new sanctions and give international negotiators a chance to find agreement on curtailing Iran's nuclear program. Cameron likewise expressed opposition to new sanctions while the nuclear talks were ongoing.

The article discusses economic conditions in Iran. Topics include the impact of declining global petroleum prices; the failure of Iran and six other countries to create a comprehensive deal concerning Iran's use of nuclear technology; and the impact of Iran's economic performance on Iranian President Hasan Rouhani and his ability to institute reform.

The article reports that international negotiators failed to reach a nuclear agreement with Iran. Topics include details on U.S. Secretary of State John Kerry's role in the nuclear program talks, mention of U.S. Republican politicians' desire for economic sanctions against Iran, and mention of Irani President Hasan Rouhani and Irani Supreme Leader Ayatollah Ali Khamenei's views of the nuclear deal.

The article reports the U.S. and other international negotiators believe it unlikely that an agreement will be reached with Iran before a November 24, 2014 deadline that would limit Iran's nuclear program in exchange for an easing of sanctions against it. U.S. Secretary of State John Kerry said an extension of the deadline was being considered. Former State Department official Mark Kirkpatrick expressed doubt that an extension would help achieve an agreement.

The article discusses U.S. relations with Iran. A letter U.S. President Barack Obama sent to Iranian Ayatollah Ali Khamenei has prompted mixed reactions within the Iranian government. Ali Khoram, an adviser to Iranian Foreign Minister Javad Zarif, said the letter could aid nuclear negotiations between the two countries. Khamenei's Website posted material critical of the U.S.

The article discusses China's ambitions to deploy a submarine fleet that includes nuclear-powered submarines and submarines capable of carrying nuclear weapons. Commentary is presented on China's intentions for the submarines, strategic implications for both China and the U.S., and the potency of the U.S. Navy relative to China's.

The article discusses growing interest among Western companies in doing business with Iran. An easing of sanctions by Western nations against Iran in exchange for greater disclosure about that country's nuclear program has prompted several firms including drug maker Sanofi Aventis SA and cement-producer Lafarge SA to send exploratory delegations to Iran.