North Korea's May 25th nuclear test capped an 8-year period in which the country ended the freeze on its plutonium program, withdrew from the NPT and claims to have weaponized its plutonium. It may have also transferred nuclear and missile technology to Syria, Pakistan and Iran.  Beginning a new chapter of persistent, direct diplomacy and learning from the mistakes of the past are key to ending the North Korean nuclear threat.  

Estimated total nuclear weapons: North Korea <10