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In this May 28, 2019 photo, Iran’s Foreign Ministry spokesman Abbas Mousavi speaks at a press conference in Tehran, Iran. (AP Photo / Vahid Salemi)

The decision to ramp up uranium enrichment came less than a week after Iran acknowledged breaking the 661-pound limit on its low-enriched uranium stockpile.

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This Jan. 15, 2011 file photo, shows a part of Arak heavy water nuclear facilities, near the central city of Arak, 150 miles southwest of the capital Tehran, Iran. (Mehdi Marizad / Fars News Agency via AP, File)

Iran acknowledged Monday it had broken the limit set on its stockpile of low-enriched uranium by the 2015 nuclear deal, marking its first major departure from the unraveling agreement a year after the U.S. unilaterally withdrew from the accord.

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In this photo released by an official website of the office of the Iranian Presidency, Iranian President Hassan Rouhani speaks in a ceremony at Imam Khomeini International Airport some 25 miles south of the capital Tehran, Iran, Tuesday, June 18, 2019. (Iranian Presidency Office via AP)

The U.S. is sending 1,000 more troops to the Middle East as tensions in the Persian Gulf mounted over Iran’s announcement it will not comply with the international agreement that keeps it from making nuclear weapons. 

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In this photo released by the official website of the office of the Iranian Presidency, President Hassan Rouhani speaks in a cabinet meeting in Tehran, Iran, Wednesday, May 8, 2019. (Iranian Presidency Office via AP)

Iran threatened Wednesday to resume higher enrichment of uranium in 60 days if world powers fail to negotiate new terms for its 2015 nuclear deal a year after President Donald Trump withdrew from the accord.

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Secretary of State Mike Pompeo speaks at a news conference at the State Department in Washington, Friday, Feb. 1, 2019. Pompeo announced that the U.S. is pulling out of a treaty with Russia that's been a centerpiece of arms control since the Cold War. (AP Photo / Andrew Harnik)

Russia’s announcement that it plans to build two new land-based missile launch systems follows the U.S. decision to withdraw from a decades-old nuclear treaty. 

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(qimono / Pixabay)

The clock hands didn’t move this year, but that’s no “sign of stability,” says Rachel Bronson, president and CEO of the Bulletin of the Atomic Scientists. Instead, she calls it a “stark warning.”

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After a whirlwind summit, President Donald Trump declares he trusts the North Korean dictator and cancels joint military exercises with South Korea.

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President Donald Trump called it “a horrible one-sided deal.” How pulling out of the Iran nuclear deal could impact talks with North Korea.

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U.S.-North Korea summit: “If it’s not a success, I will respectfully leave,” President Donald Trump said Monday, April 30.

President Donald Trump says he’s hopeful that talks with North Korea’s leader will end that nation’s nuclear weapons program, but that “if it’s not a success, I will respectfully leave.”

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For first time since the height of the Cold War, the hands of the Doomsday Clock, a symbolic indicator of how close we are to a global catastrophe, have been moved to 11:58 p.m. This is the closest the clock has been to midnight since 1953.

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Protests erupt in South Korea as a delegation from North Korea arrives ahead of the Winter Olympics. Can Olympic diplomacy defuse the threat of war on the Korean Peninsula?

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How would Illinois residents be notified of a nuclear threat – and where should they seek shelter if an alert was issued? We speak with the Illinois Emergency Management Agency. 

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White House national security adviser H.R. McMaster believes the U.S. is inching closer to war with North Korea.

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Eric Isaacs, EVP for Research, Innovation and National Laboratories at UChicago

The nuclear age was triggered in Chicago 75 years ago this week. We remember that fateful day, the man behind it and the lingering implications.

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(Walter Albertin / Wikimedia Commons)

The days when Americans fretted over an imminent U.S.-Soviet nuclear showdown might be over, but the consequences of a new nuclear age are still reverberating today.

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Why did the Trump transition team target Department of Energy staffers who worked on climate change? What does the future hold for climate research and nuclear weapons? A one-on-one interview with the current U.S. Secretary of Energy.