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Byline: Michael Callahan, CNN (CNN) -- (CNN) — The US Air Force on Wednesday tested an unarmed nuclear-capable long-range missile, according to the Air Force Global Strike Command. The unarmed [...]

Byline: Jackie Wattles, CNN (CNN) -- A nuclear thermal rocket engine in development could one day transport humans to Mars. The Defense Advanced Research Projects Agency, a research arm of [...]

Byline: Jackie Wattles, CNN (CNN) -- A nuclear thermal rocket engine in development could one day transport humans to Mars. The Defense Advanced Research Projects Agency, a research arm of [...]

Byline: Jim Sciutto, Chief National Security Correspondent (CNN) -- The US observed Russian naval vessels preparing for a possible test of a new nuclear-powered torpedo in recent weeks, a senior [...]

Byline: Kevin Liptak, Katie Bo Lillis, Phil Mattingly and Kylie Atwood, CNN (CNN) -- A lack of hard intelligence inside North Korea is curtailing the United States' ability to determine [...]

Byline: Michael Callahan, CNN (CNN) -- The US Air Force on Tuesday tested an unarmed nuclear-capable long-range missile, according to the Air Force Global Strike Command. The unarmed Minuteman III [...]

Byline: Opinion by Ben Ray Luján (CNN) -- As the sun rose over Tularosa, New Mexico, on July 16, 1945, Henry Herrera helped his father fill their truck's radiator. Suddenly, [...]

Byline: Barbara Starr, CNN Pentagon Correspondent (CNN) -- US military and intelligence agencies assess that North Korea could be ready to resume underground nuclear testing this month, according to three [...]

Byline: Barbara Starr, CNN Pentagon Correspondent (CNN) -- US military and intelligence agencies assess that North Korea could be ready to resume underground nuclear testing this month, according to three [...]

Byline: Barbara Starr, CNN Pentagon Correspondent (CNN) -- US military and intelligence agencies assess that North Korea could be ready to resume underground nuclear testing this month, according to three [...]

Byline: Barbara Starr, CNN Pentagon Correspondent (CNN) -- US military and intelligence agencies assess that North Korea could be ready to resume underground nuclear testing this month, according to three [...]

Byline: Barbara Starr, CNN Pentagon Correspondent (CNN) -- US military and intelligence agencies assess that North Korea could be ready to resume underground nuclear testing this month, according to three [...]

Byline: Barbara Starr, Zachary Cohen and Jeremy Herb, CNN (CNN) -- New commercial satellite imagery is showing some of the clearest signs to date that North Korea is tunneling again [...]

Byline: Barbara Starr and Jeremy Herb, CNN (CNN) -- The United States and allies believe that North Korea is beginning to make preparations for a possible underground nuclear test for [...]

Byline: Zachary Cohen, CNN (CNN) -- New satellite images obtained by CNN show Russia may be preparing another test of its nuclear-powered cruise missile, known as 'Skyfall'-- a controversial weapon [...]

Byline: Will Ripley, Tim Schwarz and Paul Devitt, CNN PUNGGYE-RI, North Korea (CNN) -- North Korea appeared to destroy at least three nuclear tunnels, observation buildings, a metal foundry and [...]

Byline: Tim Schwarz, Will Ripley and Paul Devitt, CNN PUNGGYE-RI, North Korea (CNN) -- North Korea appeared to destroy at least three nuclear tunnels, observation buildings, a metal foundry and [...]

Byline: Tim Schwarz, Will Ripley and Paul Devitt, CNN PUNGGYE-RI, North Korea (CNN) -- North Korea appeared to destroy at least three nuclear tunnels, observation buildings, a metal foundry and [...]

Byline: Tim Schwarz, Will Ripley and Paul Devitt, CNN PUNGGYE-RI, North Korea (CNN) -- North Korea destroyed at least three nuclear tunnels, observation buildings, a metal foundry and living quarters [...]

Byline: Joshua Berlinger, CNN (CNN) -- Satellite images appear to show North Korea is shuttering its nuclear test site, according to analysts from North Korean monitoring site 38 North. Analysis [...]

Byline: Laura Smith-Spark, CNN (CNN) -- North Korea outlined steps Saturday to dismantle its nuclear testing site -- and confirmed that international journalists, including those from the United States and [...]

Byline: Laura Smith-Spark, CNN (CNN) -- North Korea outlined steps Saturday to dismantle its nuclear testing site -- and confirmed that international journalists, including from the United States and the [...]

Byline: Ben Westcott, Yoonjung Seo and Eli Watkins, CNN SEOUL (CNN) -- North Korean leader Kim Jong Un will shut down his nuclear test site in May and invite experts [...]

Byline: Ben Westcott, Yoonjung Seo and Eli Watkins, CNN (CNN) -- North Korean leader Kim Jong Un told South Korean President Moon Jae-in that he will shut down his main [...]

Byline: Ben Westcott, Yoonjung Seo and Eli Watkins, CNN (CNN) -- North Korean leader Kim Jong Un told South Korean President Moon Jae-in that he will close his main nuclear [...]

Byline: Joshua Berlinger and Serenitie Wang, CNN (CNN) -- North Korea's nuclear test in September last year was so strong that it caused an on-site collapse at the test site, [...]

Byline: Sophie Jeong, Will Ripley and Euan McKirdy, CNN SEOUL, South Korea (CNN) -- North Korea says its quest for nuclear weapons is 'complete' and it 'no longer needs' to [...]

Byline: Sophie Jeong, Will Ripley and Euan McKirdy, CNN SEOUL, South Korea (CNN) -- North Korea says its quest for nuclear weapons is 'complete' and it 'no longer needs' to [...]

Byline: Sophie Jeong, Will Ripley and Euan McKirdy, CNN SEOUL, South Korea (CNN) -- North Korea says its quest for nuclear weapons is 'complete' and it 'no longer needs' to [...]

Byline: Sophie Jeong, Will Ripley and Euan McKirdy, CNN SEOUL, South Korea (CNN) -- North Korea says its quest for nuclear weapons is 'complete' and it 'no longer needs' to [...]

Byline: Sophie Jeong and Will Ripley, CNN SEOUL, South Korea (CNN) -- North Korean leader Kim Jong Un said the regime no longer needs nuclear tests or intercontinental ballistic missile [...]

Byline: Sophie Jeong, Will Ripley and Euan McKirdy, CNN SEOUL, South Korea (CNN) -- North Korea says its quest for nuclear weapons is 'complete' and it 'no longer needs' to [...]

Byline: Sophie Jeong and Will Ripley, CNN SEOUL, South Korea (CNN) -- North Korea says its quest for nuclear weapons is 'complete' and it 'no longer needs' to test its [...]

Byline: Sophie Jeong and Will Ripley, CNN SEOUL, South Korea (CNN) -- North Korean leader Kim Jong Un said the regime no longer needs nuclear tests or intercontinental ballistic missile [...]

Byline: Sophie Jeong and Will Ripley, CNN SEOUL, South Korea (CNN) -- North Korean leader Kim Jong Un said the regime no longer needs nuclear tests or intercontinental ballistic missile [...]

Byline: Sophie Jeong and Will Ripley, CNN SEOUL, South Korea (CNN) -- North Korean leader Kim Jong Un said the regime no longer needs nuclear tests or intercontinental ballistic missile [...]

Byline: Sophie Jeong and Will Ripley, CNN SEOUL, South Korea (CNN) -- North Korean leader Kim Jong Un said the regime no longer needs nuclear tests or intercontinental ballistic missile [...]

Byline: Sophie Jeong, CNN SEOUL, South Korea (CNN) -- North Korean leader Kim Jong Un said the regime no longer needs nuclear tests or intercontinental ballistic missile tests, state-run KCNA [...]

Byline: Doug Criss, CNN (CNN) -- Hawaii is taking those threats from North Korea seriously. Starting Friday, the state will start monthly testing of a nuclear warning siren system aimed [...]

Byline: Euan McKirdy, Taewoon Lee and Samantha Beech, CNN SEOUL, South Korea (CNN) -- South Korea's spy agency predicts Pyongyang is preparing to carry out additional nuclear tests, after noting [...]

Byline: Joe Sterling, Taehoon Lee and Stella Ko, CNN (CNN) -- Analysts say that seismic activity detected Saturday near the site of North Korea's Punggye-ri nuclear site may be aftershocks [...]

Byline: Joshua Berlinger and Zahra Ullah, CNN (CNN) -- North Korea could test a powerful nuclear weapon over the Pacific Ocean in response to US President Donald Trump's threats of [...]

Byline: Joshua Berlinger, CNN (CNN) -- North Korea just intimated that it may test a nuclear weapon somewhere above the Pacific Ocean. If Pyongyang follows through on the threat, it [...]

Byline: Joshua Berlinger and Zahra Ullah, CNN (CNN) -- North Korea's foreign minister warned Thursday that Pyongyang could test a powerful nuclear weapon over the Pacific Ocean in response to [...]

Byline: Joshua Berlinger and Zahra Ullah, CNN (CNN) -- North Korea's foreign minister hinted Thursday that Pyongyang could test a powerful nuclear weapon in the Pacific Ocean in response to [...]

Byline: Joshua Berlinger and Zahra Ullah, CNN (CNN) -- North Korea's foreign minister hinted Thursday that Pyongyang could test a powerful nuclear weapon over the Pacific Ocean in response to [...]

Byline: Steven Jiang, CNN BEIJING (CNN) -- China -- North Korea's only global ally and biggest trading partner -- has put on a stoic face since Pyongyang successfully conducted its [...]

Byline: Joshua Berlinger and Taehoon Lee, CNN SEOUL, South Korea (CNN) -- South Korea has conducted a live-fire exercise early Monday morning local time in response to North Korea's nuclear [...]

Byline: Joshua Berlinger and Taehoon Lee, CNN SEOUL, South Korea (CNN) -- The crisis on the Korean peninsula intensified on Monday as South Korea said it appeared the North was [...]

Byline: Joshua Berlinger and Taehoon Lee, CNN SEOUL, South Korea (CNN) -- The crisis on the Korean peninsula intensified on Monday as South Korea said it appeared the North was [...]