Today is the 13th day of the Russian invasion of Ukraine. By point of comparison, the most dangerous phase of the Cuban missile crisis lasted 13 days in all. A thread on the similarities and differences between the two crises. 1/ History never repeats itself exactly. 2022 is very different from 1962. But there are some truths that remain eternal, particularly in a nuclear age. Most important lesson of missile crisis is that mistakes/miscalculations increasingly likely as you move up escalatory ladder. 2/