North Korea's ambassador to the United Nations in Geneva, Han Tae Song, said on Sept. 5 that the country's recent nuclear and missile tests "are a gift package addressed to none other than the U.S." The same day, U.S. Ambassador U.N. Nikki Haley said, "Enough is enough," indicating that it's time for more drastic measures to stop North Korea's provocative and dangerous actions. Nuclear weapons in an unstable North Korea raise a range of concerns, including, as Dr. James Turner, former Department of Energy director of the Office of Nuclear Weapons Surety, asks, who's in control of North Korea's nukes?