It is January 2018, at the height of “fire and fury” fears about North Korean nuclear tests and long-range missiles; I know more than I want to know about nuclear weapons. Bruce and I have spent decades of our lives working on US-Russian relations… We face a complex set of nuclear threats that could lead to a 21st century Armageddon in any number of ways—through bluster, blunder, accident, miscalculation, malfunctioning sensors, malware, terrorist computer hacking, or simple human rage and reaction. – Bulletin of the Atomic Scientists