Tensions on the Korean Peninsula have risen quickly this week on the heels of another long-range missile test, combined with public revelations that the Kim Jong-un regime may have miniaturized a nuclear weapon that can be mated to such a missile. If the North Koreans have also managed to solve the other significant challenges associated with a viable intercontinental ballistic missile (ICBM)—which is not at all certain—then they will have achieved an embryonic operational capability.