Contemplating Russian nuclear threats during the Cold War, the strategist Herman Kahn calibrated a macabre ladder of escalation, with 44 rungs ranging from “Ostensible Crisis” to “Spasm or Insensate War.” In the era of cyberwarfare that’s now dawning, the rules of the game haven’t yet been established with such coldblooded precision. That’s why this period of Russian-American relations is so tricky. The strategic framework that could provide stability hasn’t been set.