South Korea

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In this photo provided by South Korea Defense Ministry, a South Korean navy ship fires a missile during a drill in South Korea's East Sea, Thursday, July 6, 2017. South Korean warplanes and navy ships have fired a barrage of missiles into the waters during one-day drills aimed at boosting a readiness against a possible North Korean aggression. (South Korea Defense Ministry via AP)

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In this photo provided by South Korea Defense Ministry, a South Korean navy ship fires a missile during a drill in South Korea's East Sea, Thursday, July 6, 2017. South Korean warplanes and navy ships have fired a barrage of missiles into the waters during one-day drills aimed at boosting a readiness against a possible North Korean aggression. (South Korea Defense Ministry via AP)

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In this photo provided by South Korea Defense Ministry, South Korea's Hyunmoo Missile II is fired during the combined military exercise between U.S. and South Korea against North Korea at an undisclosed location in South Korea, Wednesday, July 5, 2017. Grinning broadly, North Korean leader Kim Jong Un delighted in the global furor created by his nation's first launch of an intercontinental ballistic missile, vowing Wednesday to never abandon nuclear weapons and to keep sending Washington more "gift packages" of missile and atomic tests. (South Korea Defense Ministry via AP)

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In this photo provided by South Korea Defense Ministry, South Korea's Hyunmoo Missile II is fired during the combined military exercise between the U.S. and South Korea against North Korea at an undisclosed location in South Korea, Wednesday, July 5, 2017. Grinning broadly, North Korean leader Kim Jong Un delighted in the global furor created by his nation's first launch of an intercontinental ballistic missile, vowing Wednesday to never abandon nuclear weapons and to keep sending Washington more "gift packages" of missile and atomic tests. (South Korea Defense Ministry via AP)

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In this photo provided by South Korea Defense Ministry, a U.S. MGM-140 Army Tactical Missile is fired during the combined military exercise between the U.S. and South Korea against North Korea at an undisclosed location in South Korea, Wednesday, July 5, 2017. Grinning broadly, North Korean leader Kim Jong Un delighted in the global furor created by his nation's first launch of an intercontinental ballistic missile, vowing Wednesday to never abandon nuclear weapons and to keep sending Washington more "gift packages" of missile and atomic tests. (South Korea Defense Ministry via AP)

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In this April 10, 2017 photo, employees of Incheon International Airport follow Troika, a self-driving robot made by LG Electronics, which moves around for visitors at the Incheon International Airport in Incheon, South Korea. Robots will start roaming South Korea’s largest airport this summer, helping travelers find their boarding gates and keep its floors clean as the country prepares for its first Winter Olympics game. (AP Photo/Ahn Young-joon)

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In this April 10, 2017 photo, the LG Electronics's cleaning robot moves to clean the floor as a worker, right, passes by on a cleaning vehicle at the Incheon International Airport in Incheon, South Korea. Robots will start roaming South Korea’s largest airport this summer, helping travelers find their boarding gates and keep its floors clean as the country prepares for its first Winter Olympics game. (AP Photo/Ahn Young-joon)

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In this April 10, 2017 photo, Yu Kyungman, left, LG Electronics' lead engineer for the team that developed the cleaning robot, follows an LG Electronics' cleaning robot at the Incheon International Airport in Incheon, South Korea. Robots will start roaming South Korea’s largest airport this summer, helping travelers find their boarding gates and keep its floors clean as the country prepares for its first Winter Olympics game. (AP Photo/Ahn Young-joon)

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In this April 10, 2017 photo, Troika, a self-driving robot made by LG Electronics, moves around for visitors at the Incheon International Airport in Incheon, South Korea. Robots will start roaming South Korea’s largest airport this summer, helping travelers find their boarding gates and keep its floors clean as the country prepares for its first Winter Olympics game. (AP Photo/Ahn Young-joon)

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In this April 10, 2017 photo, Amethyst Ma, left, from San Jose, California, talks with Troika, a self-driving robot made by LG Electronics, at the Incheon International Airport in Incheon, South Korea. Robots will start roaming South Korea’s largest airport this summer, helping travelers find their boarding gates and keep its floors clean as the country prepares for its first Winter Olympics game. (AP Photo/Ahn Young-joon)

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A TV news program shows a file image of North Korean leader Kim Jong-un, at Seoul Railway Station in Seoul, South Korea. in Seoul, South Korea, Tuesday, July 4, 2017. North Korea on Tuesday launched yet another ballistic missile in the direction of Japan, South Korean officials said, part of a string of recent test-firings as the North works to build a nuclear-tipped missile that could reach the United States. The signs read " North Korea launched a missile after a summit meeting of South Korea and the United States." (AP Photo/Ahn Young-joon)

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So Yeon Ryu of South Korea watches her tee shot on the fifth hole during the final round of the Women's PGA Championship golf tournament at Olympia Fields Country Club, Sunday, July 2, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Chella Choi, of South Korea, strikes her tee shot on the fifth hole during the final round of the Women's PGA Championship golf tournament at Olympia Fields Country Club, Sunday, July 2, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Ji Yeon Choi, left, father and caddie for Chella Choi, of South Korea, talks to his daughter on the fifth tee during the final round of the Women's PGA Championship golf tournament at Olympia Fields Country Club, Sunday, July 2, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Chella Choi, of South Korea, watches her tee shot on the fifth hole during the third round of the Women's PGA Championship golf tournament at Olympia Fields Country Club Saturday, July 1, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Chella Choi, of South Korea, reacts to photographers taking her photo during the second round of the Women's PGA Championship golf tournament at Olympia Fields Country Club, Friday, June 30, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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So Yeon Ryu, of South Korea, reacts to her putt on the fourth hole during the second round of the Women's PGA Championship golf tournament at Olympia Fields Country Club Friday, June 30, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Sei Young Kim, of South Korea, right, looks over her birdie attempt with caddie, Paul Fusco, on the ninth green during the second round of the Women's PGA Championship golf tournament at Olympia Fields Country Club Friday, June 30, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Amy Yang, of South Korea, looks over the 14th green during the second round of the Women's PGA Championship golf tournament at Olympia Fields Country Club Friday, June 30, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)

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Amy Yang, of South Korea, watches her tee shot on the 15th hole during the first round of the Women's PGA Championship golf tournament at Olympia Fields Country Club on Thursday, June 29, 2017, in Olympia Fields, Ill. (AP Photo/Charles Rex Arbogast)