Weapons administration

Japanese Prime Minister Shinzo Abe speaks to the media at the prime minister's official residence in Tokyo shortly after learning that North Korea conducted a missile launch test, Sunday morning, May 14, 2017. Japan's Chief Cabinet Secretary Yoshihide Suga said the missile test-fired by North Korea flew 800 kilometers (500 miles) for about 30 minutes and landed in the Sea of Japan, but not inside Japan's exclusive economic zone. (Hiroki Yamauchi/Kyodo News via AP)

Japanese Prime Minister Shinzo Abe speaks to the media at the prime minister's official residence in Tokyo shortly after learning that North Korea conducted a missile launch test, Sunday morning, May 14, 2017. Japan's Chief Cabinet Secretary Yoshihide Suga said the missile test-fired by North Korea flew 800 kilometers (500 miles) for about 30 minutes and landed in the Sea of Japan, but not inside Japan's exclusive economic zone. (Hiroki Yamauchi/Kyodo News via AP)

FILE - In this April 13, 2017 file photo, North Korean leader Kim Jong Un, center, is accompanied by Pak Pong Ju, right, Hwang Pyong So, second left, as he arrives for the official opening of the Ryomyong residential area, in Pyongyang, North Korea. Pyongyang will seek the extradition of anyone involved in what it says was a CIA-backed plot to kill leader Kim Jung Un April, 2017, with a biochemical poison, a top North Korean foreign ministry official said Thursday, May 11, 2017.(AP Photo/Wong Maye-E, File)

Japanese Prime Minister Shinzo Abe speaks to the media at the prime minister's official residence in Tokyo shortly after learning that North Korea conducted a missile launch test, Sunday morning, May 14, 2017. Japan's Chief Cabinet Secretary Yoshihide Suga said the missile test-fired by North Korea flew 800 kilometers (500 miles) for about 30 minutes and landed in the Sea of Japan, but not inside Japan's exclusive economic zone. (Hiroki Yamauchi/Kyodo News via AP)

Choi Sun-hee, left, the top North Korean diplomat who handles relations with the U.S. walks prior to her departure for Pyongyang, North Korea, at Beijing Capital International Airport in Beijing Saturday, May 13, 2017. Choi said Pyongyang would be willing to meet with the Trump administration for negotiations "if the conditions are set," briefly to reporters en route to Pyongyang. She was traveling from Norway, where she led a delegation that held an informal meeting with U.S. experts. (Kyodo News via AP)

FILE--In this July 9, 2014, file photo, a sign warns of radioactivity near a wind direction flag indicator at the "C" tank farm on the Hanford Nuclear Reservation near Richland, Wash. An emergency has been declared Tuesday, May 9, 2017, at the Hanford Nuclear Reservation after a portion of a tunnel that contained rail cars full of nuclear waste collapsed. Randy Bradbury, a spokesman for the Washington state Department of Ecology, said officials detected no release of radiation and no workers were injured. (AP Photo/Ted S. Warren, file)

This image provided by the U.S. Department of Energy shows a 20-foot by 20-foot hole in the roof of a storage tunnel at the Hanford Nuclear Reservation near Richland, Wash., Tuesday, May 9, 2017. An emergency was declared Tuesday after the partial collapse of the tunnel that contains rail cars full of radioactive waste. (U.S. Department of Energy via AP)

FILE - In this Dec. 6, 2016 file photo, Iowa Gov. Terry Branstad speaks to members of the media in the lobby of Trump Tower in New York. A Senate panel has approved Branstad as U.S. ambassador to China. (AP Photo/Andrew Harnik, File)

FILE - In this Thursday, May 4, 2017 file photo, South Korean presidential candidate Moon Jae-in of the Democratic Party greets supporters during an election campaign in Goyang, South Korea. For South Koreans living next door to a hostile, nuclear-armed state that regularly threatens their annihilation, their vote in Tuesday’s presidential election likely will be based in part on each candidate’s plan for how to handle North Korea. The North Korea conundrum is a perpetual foreign policy headache for South Korea’s leaders and one that is impacting the presidential race in several ways. (AP Photo/Lee Jin-man, File)