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PAC-3 Patriot missile units are deployed in the compound of Defense Ministry in Tokyo, Thursday, Aug. 10, 2017. North Korea claims it is in the final stages of preparing a plan to launch four intermediate-range ballistic missiles over Japan and into waters just off the island of Guam, where about 7,000 U.S. troops are based. (AP Photo/Shizuo Kambayashi)
PAC-3 Patriot missile units are deployed in the compound of Defense Ministry in Tokyo, Thursday, Aug. 10, 2017. North Korea claims it is in the final stages of preparing a plan to launch four intermediate-range ballistic missiles over Japan and into waters just off the island of Guam, where about 7,000 U.S. troops are based. (AP Photo/Shizuo Kambayashi)

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Japan readies missile interference systems

CNN's Kyung Lah reports from Tokyo on how Japan is preparing for a potential missile strike from North Korea, which would fly over the nation.

Japan readies missile interference systems

CNN's Kyung Lah reports from Tokyo on how Japan is preparing for a potential missile strike from North Korea, which would fly over the nation.