Frank Klotz examines President Obama's Berlin speech and his new nuclear weapons guidance and finds them to be a sensible and balanced approach in the post-Cold War world.

The United States and a growing number of countries have intensified sanctions on Iran over its nuclear program, weakening its economy, but debate persists over their impact.

The United States has long struggled with how to manage Iran's nuclear ambitions. Any U.S. military option in Iran is likely to be dynamic, depending on its objectives.

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According to Meghan O'Sullivan, U.S. action in Syria may have implications for Iran and its nuclear program.

Gregory Koblentz weighs the U.S. foreign policy options toward Iran.

Iran's nuclear ambitions are likely driven by multiple factors, from security concerns to domestic polices. However, political competition within Iran, rather than Israel's nuclear capabilities, plays a more significant role in driving Iran's nuclear ambition.

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Since North Korea conducted its latest nuclear test in February 2013, a spiral of heightened international pressure and increasingly threatening provocations by Pyongyang has ensued.

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It is time for Washington to rebalance its dual-track policy toward Iran, strengthening the diplomatic track in order to seize the opportunity created by the pressure track. The United States should now dedicate as much energy and creativity to negotiating directly with Iran as it has to assembling a broad international coalition to pressure and isolate Iran. Only by taking such a rebalanced approach might the United States achieve its objectives with respect to Iran's nuclear program.

Secretary of State John Kerry spoke on April 12, 2013, at the American Chamber of Commerece in Seoul after his meetings with South Korean President Park and South Korean Foreign Minister Yun. He discussed economic cooperation between the Republic of Korea and the United States and nuclear issues in the region.

Rather than seeking regime overthrow in North Korea and Iran, Washington should pursue an updated version of Soviet-era containment policy, says expert Robert Litwak.

Ray Takeyh warns that the West is falling into a diplomacy trap set by Iranian clerics regarding the nuclear Non-Prolifieration Treaty (NPT).

Former prime minister of Australia Kevin Rudd discusses the ongoing situation surrounding North Korea's nuclear weapons program and the future of U.S.-China relations with Foreign Affairs managing editor Jonathan Tepperman.

China's recent push to renew the Six Party Talks, stalled since 2008, has raised hopes for progress on the peninsula despite worries that Pyongyang may have restarted its old nuclear reactor.

The UN Security Council passed this resolution including economic sanctions on North Korea on March 7, 2013, after North Korea's nuclear test on February 12, 2013. North Korea said it will end its armistice agreement with South Korea if the resolution passed.

Participants discuss possible U.S. policy approaches to Iran's nuclear program and the recently concluded talks in Almaty, Kazakhstan.

North Korean Supreme Command of the Korean Army released this statement on March 5, 2013, saying that North Korea will no longer recognize the Korean Armistice Agreement if the UN Security Council passed a resolution and sanctions against North Korea after its February nuclear test.

North Korea's third successful nuclear test has been widely condemned by the international community. CFR's Paul Stares highlights three things to know about the test and its implications for nuclear nonproliferation.

Ayatollah Ali Khamenei made these remarks at a meeting with Iran's air force on February 7, 2013, responding to U.S. Vice President Joe Biden's offer of direct talks about Iran's nuclear program.

Halting Iran's progress toward a bomb will require the United States to make credible promises and credible threats simultaneously -- an exceedingly difficult trick to pull off.