A North Korean man reads a local newspaper on Sunday with an image of leader Kim Jong Un. Kim said during a critical ruling party congress that his country will not use its nuclear weapons first unless its sovereignty is invaded, state media reported. Kim Kwan Hyon/AP hide caption

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N. Korea Wants Economic And Nuclear Expansion, But One Undercuts The Other
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Otto Frederick Warmbier, a 21-year-old American student, speaks during a news conference in Pyongyang on Feb. 29. Xinhua News Agency/Getty Images hide caption

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People watch a news report at a railway station in Seoul on Feb. 3. North Korea launched a long-range rocket Sunday local time, defying international criticism. Jung Yeon-Je/AFP/Getty Images hide caption

toggle caption Jung Yeon-Je/AFP/Getty Images