Workers in Seoul's Yongsan ward office wait in a parking garage for an all-clear sign during a recent air raid drill. Concerned about a possible attack by North Korea, the South Koreans hold the drills twice a year. Elise Hu/NPR hide caption

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Elise Hu/NPR

In S. Korea, Air Raid Drills Are A Reminder Of N. Korean Threat

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North Korean leader Kim Jong Un looks at a warhead component being developed for a ballistic missile, at an unidentified location in this undated photo released by North Korea's Korean Central News Agency on March 15, 2016. KCNA/Reuters hide caption

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KCNA/Reuters

Mount Paektu, which sits on the border with China, is known in North Korea as the "sacred mountain of revolution" and considered the legendary birthplace of Kim Jong Il and Korean culture. David Guttenfelder/AP hide caption

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David Guttenfelder/AP

North Korean Volcano Provides Rare Chance For Scientific Collaboration

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A statue of Mozambique's first president, Samora Machel, at a city square in the capital Maputo. The monument is one of many similar statues built throughout Africa by North Korean workers. The United Nations on Wednesday banned the export of North Korean monuments, saying the government was earning hard currency that could be used to advance its nuclear program. Thomas Trutschel/Photothek via Getty Images hide caption

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Thomas Trutschel/Photothek via Getty Images

This undated photo released by North Korea's official Korean Central News Agency on Nov. 11 shows North Korean leader Kim Jong-Un at a defense detachment on Mahap Islet. KNS/AFP/Getty Images hide caption

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KNS/AFP/Getty Images

How Uncertainty In The Korean Peninsula Could Be A 'Recipe for Disaster'

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This undated picture released from North Korea's official Korean Central News Agency on Aug. 4 shows North Korean leader Kim Jong Un delivering a speech at the April 25 House of Culture in Pyongyang. KCNA Via KNS/AFP/Getty Images hide caption

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KCNA Via KNS/AFP/Getty Images

Then-Secretary of State Madeleine Albright and North Korean leader Kim Jong Il toast in Pyongyang on Oct. 24, 2000. The U.S. and North Korea signed an agreement six years earlier to curb North Korea's nuclear activities in exchange for aid, but it collapsed in 2002, during the Bush administration. Chien-Min Chung/AP hide caption

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Chien-Min Chung/AP

Will Iran Deal Meet The Same Fate As A Past U.S.-North Korean Arms Deal?

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Visitors look at the China-North Korea Friendship Bridge across the Yalu River from Dandong, in northeast China. A company operating from Dandong is under fresh sanctions by the U.S. Greg Baker/AFP/Getty Images hide caption

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Greg Baker/AFP/Getty Images

U.S. Targets Chinese Company For Supporting N. Korean Nuclear Program

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Kim Chol Ho, deputy manager of the Rajin port, in North Korea's Rason Special Economic Zone, looks out at small fishing boats. Despite stepped-up international sanctions, North Korea is still trading extensively with China. Eric Talmadge/AP hide caption

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Eric Talmadge/AP

The 'Livelihood Loophole' And Other Weaknesses Of N. Korea Sanctions

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A Chinese flag flies on a boat next to the bridge that spans the Yalu River linking the North Korean town of Sinuiju with the Chinese town of Dandong. Most of North Korea's trade is with China, and much of it crosses the border here. Mark Ralston/AFP/Getty Images hide caption

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Mark Ralston/AFP/Getty Images

Japan meteorological agency officer Gen Aoki displays seismic readings that are apparently a result of a nuclear weapons test in North Korea on Friday morning. North Korea later confirmed it had conducted its fifth nuclear test. Kazuhiro Nogi /AFP/Getty Images hide caption

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Kazuhiro Nogi /AFP/Getty Images

North Korea Conducts Its 5th Test Of Nuclear Weapon

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