A rescue member (C) in full protective gear stands amongst South Korean soldiers wearing gas masks during an anti-terror drill on the sidelines of South Korea-US joint military exercise, called Ulchi Freedom, at a subway station in Seoul on August 23, 2016. South Korea and the United States kicked off large-scale military exercises on August 22, triggering condemnation and threats of a pre-emptive nuclear strike from North Korea. (Photo by Jung Yeon-Je/AFP Photo)





South Korean army soldiers stand as women watch during an anti-terror drill as part of the Ulchi Freedom Guardian exercise, at Yoido Subway Station in Seoul, South Korea, Tuesday, August 23, 2016. South Korea and the United States began annual military drills Monday despite North Korea's threat of nuclear strikes in response to the exercises that it calls an invasion rehearsal. (Photo by Ahn Young-joon/AP Photo)





Japan Ground Self-Defense Force (JGSDF)'s tanks and helicopters participate in a fire drill at Higashi Fuji training field in Gotenba, central Japan, 25 August 2016. About 2,400 JGSDF personnel with some 80 tanks and armored vehicles participated in the drill, taking place also on 27 and 28 August. (Photo by Kimimasa Mayama/EPA)





A line of Japan Ground Self-Defense Force tanks flare up a smoke screen during an annual live firing exercise at Higashi Fuji training range in Gotemba, southwest of Tokyo, Thursday, August 25, 2016. (Photo by Eugene Hoshiko/AP Photo)





Japan Ground Self-Defense Force's Type-10 tank fires its gun at a target during an annual live firing exercise at Higashi Fuji range in Gotemba, southwest of Tokyo, Thursday, August 25, 2016. (Photo by Eugene Hoshiko/AP Photo)





A Japanese Ground Self-Defense Force AH-1S helicopter fires anti-tank missile during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, August 25, 2016. (Photo by Kim Kyung-Hoon/Reuters)





Japanese Ground Self-Defense Force soldiers take part in an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, August 25, 2016. (Photo by Kim Kyung-Hoon/Reuters)





Japanese Ground Self-Defense Force soldiers descend from a helicopter with ropes during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, August 25, 2016. (Photo by Kim Kyung-Hoon/Reuters)





Japanese Ground Self-Defense Force soldiers descend from a helicopter with ropes during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, August 25, 2016. (Photo by Kim Kyung-Hoon/Reuters)





Japanese Ground Self-Defense Force tanks fire during an annual training session near Mount Fuji at Higashifuji training field in Gotemba, west of Tokyo, August 25, 2016. (Photo by Kim Kyung-Hoon/Reuters)





Taiwan's President Tsai Ing-wen wearing a camouflage helmet and bulletproof vest delivers a speech during the annual Han Kuang exercises in Pingtung county, Southern Taiwan, Thursday, August 25, 2016. (Photo by Chiang Ying-ying/AP Photo)





A soldier pretends to lie dead in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





Soldiers drive CM33 “Clouded Leopard” infantry fighting vehicle during annual Han Kuang military drill simulating the China's People's Liberation Army (PLA) invading the island, in Pingtung county, southern Taiwan August 25, 2016. (Photo by Tyrone Siu/Reuters)





Soldiers take part in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





Soldiers take part in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





Soldiers take part in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





Soldiers take part in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





A soldier wears night vision goggles as he takes part in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





Taiwanese soldiers launch an anti-tank weapon APILAS during the annual Han Kuang exercises in Pingtung county, Southern Taiwan, Thursday, August 25, 2016. (Photo by Chiang Ying-ying/AP Photo)





A soldier takes part in the annual Han Kuang military drill, simulating the China's People's Liberation Army (PLA) invading the island, outside Hsuehshan tunnel, in Yilan, Taiwan August 24, 2016. (Photo by Tyrone Siu/Reuters)





People wearing and holding helmets take part in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. The drill was held in Ginza, a high-end shopping and business district, and held ahead of the 93rd anniversary of the Great Kanto Earthquake of 1923 which claimed at least 100,000 casualties. It was one of the largest natural disasters in recorded history and since 1960, September 1st, and the period around that date has been declared as national disaster prevention awareness period. (Photo by Kim Kyung-Hoon/Reuters)





People carry a man role-playing as an injured person on a stretcher in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. (Photo by Kim Kyung-Hoon/Reuters)





People wearing and holding helmets take part in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. (Photo by Kim Kyung-Hoon/Reuters)





A man role-playing as an injured person takes part in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. (Photo by Kim Kyung-Hoon/Reuters)





A fire worker in a crane rescues a man role-playing as a person who is isolated atop of a building in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. (Photo by Kim Kyung-Hoon/Reuters)





People wearing helmets take part in a drill simulating a 7.2 magnitude earthquake in Tokyo, Japan, August 26, 2016. (Photo by Kim Kyung-Hoon/Reuters)