Seoul

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Patriot PAC-3 anti-missile interceptors help protect the 23,468 U.S. and South Korean troops deployed at the U.S. Army Garrison Humphreys, built as part of a multiyear effort to relocate American forces outside Seoul.

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A man watches a TV news program showing photos published in North Korea's Rodong Sinmun newspaper of North Korea's new type of cruise missile launch, at Seoul Railway station in Seoul, South Korea, Friday, June 9, 2017. North Korea said Friday it has tested a new type of cruise missile that could strike U.S. and South Korean warships "at will" if it is attacked, in an apparent reference to the projectiles detected by Seoul when they were launched a day earlier. (AP Photo/Ahn Young-joon)

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A name of Samsung Biologics Co. is displayed at the Korea Exchange in Seoul, South Korea, Thursday, Nov. 10, 2016. Samsung Biologics Co., the contract drug making unit of Samsung Group, made its market debut in Seoul on Thursday in South Korea's largest initial public offering in six years. (AP Photo/Lee Jin-man)

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TV screens show file footage of a similar North Korea's ballistic missile that North Korea claimed to have launched from underwater at the Yongsan Electronic store in Seoul, South Korea, Wednesday, Aug. 24, 2016. A North Korean ballistic missile fired from a submarine Wednesday flew about 500 kilometers (310 miles) in the longest flight by that type of weapon, Seoul officials said, a range that can place much of South Korea within its striking distance. (AP Photo/Ahn Young-joon)

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Anote Tong, the president of the tiny Pacific island of Kiribati, speaks in Seoul, South Korea, after receiving the first-ever Sunhak Peace Prize.

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The Ashley Madison cheating website is shown on a computer screen in Seoul on June 10, 2015. (Associated Press) **FILE**

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[u'U.S. Ambassador to South Korea Mark Lippert eaves a lecture hall for a hospital in Seoul, South Korea, Thursday, March 5, 2015 after being attacked by a man. Lippert was attacked by a man wielding a razor and screaming that the rival Koreas should be unified, South Korean police and media said Thursday. (AP Photo/Yonhap, Kim Ju-Sung) KOREA OUT', u'U.S. Ambassador to South Korea Mark Lippert leaves a lecture hall for a hospital in Seoul, South Korea, Thursday, March 5, 2015 after being attacked by a man. Lippert was slashed on the face and wrist by a man wielding a knife with a 10-inch blade and screaming that the rival Koreas should be unified, South Korean police said Thursday. (AP Photo/Yonhap, Kim Ju-Sung) KOREA OUT']

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Samsung Electronics introduces its SUHD 4K smart TV in Seoul, South Korea (Associated Press) ** FILE **

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A man watches a TV news program showing North Korean leader Kim Jong-un, at the Seoul Railway Station in Seoul, South Korea, Thursday, Jan. 1, 2015. (AP Photo/Ahn Young-joon) ** FILE **

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The shadow of a visitor taking a picture is cast on a board with messages wishing safe return of missing passengers aboard the sunken ferry Sewol at a port in Jindo, south of Seoul, South Korea, Tuesday, April 22, 2014. One by one, coast guard officers carried the newly arrived bodies covered in white sheets from a boat to a tent on the dock of this island, the first step in identifying a sharply rising number of corpses from a South Korean ferry that sank nearly a week ago. (AP Photo/Lee Jin-man)

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A man reads messages showing signs of hope for the safe return of passengers of the sunken Sewol ferry in Ansan, south of Seoul, South Korea, Thursday, April 24, 2014. Students in the city hit hardest by the South Korean ferry disaster returned to classes Thursday, their school campus a tragic landscape of yellow ribbons, chrysanthemums and photos of classmates and teachers who make up the vast majority of the more than 300 people feared dead. (AP Photo/Lee Jin-man)