Well, I think this threat from N. Korea and the recent nuke deal that Obama just made with Iran is very alarming.
..."Iran and the Stalinist regime of the Kim dynasty in North Korea have erected a formidable alliance—the centerpiece of which is cooperation on nuclear and ballistic-missile capabilities...Indeed, North Korea’s arsenal is the inspiration behind most of Iran’s ballistic-missile capabilities—including the Shahab 3 and Shahab 4, now in service, and its longer-range Shahab 5 and 6 variants, currently in development. And the collaboration continues today; the two nations are believed to be jointly working on a nuclear-capable missile of intercontinental range.
The Islamic Republic has also relied on the DPRK for help with its nuclear program. In recent years, North Korea is known to have assisted in fortifying a number of Iranian nuclear facilities against possible preemptive strikes. It has also reportedly dispatched hundreds of nuclear experts to work within the Islamic Republic, as well as providing Tehran with key nuclear software...
http://www.nationalinterest.org/feature/north-korea-irans-pathway-nuclear-weapon-13570