The Berlin Wall’s fall is one of history’s most recognizable examples of a rapid, largely unforeseen cascading failure. Engineers describe this as a cascading failure: a system that appears stable until one relatively small event reveals weaknesses that have accumulated over time. Ukraine’s increasing long-range strikes are creating hours-long gas lines all over Russia and forcing Russia to buy diesel fuel from India for the first time. The Prigozhin rebellion demonstrated that thousands of armed Russians were willing to march toward Moscow with Russians fighting Russians on Russian soil. Neither Iran nor Russia is likely to collapse tomorrow.