US spy planes watching for possible North Korea nuke test


North Korea says 'don't mess with us' as US weighs its options The U.S. Air Force's special sniffer plane is capable of detecting evidence of a nuclear explosion. More from NBC News:Why scrapping nuclear deal could boost Iran's hardlinersU.S. may not be able to shoot down North Korean missiles: ExpertsTrump orders review of Iran nuke deal sanctions: Tillerson

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