 But that's their basically only option is to threaten mutual assured destruction. Well, surprisingly, it kept the peace between the U.S. and the Soviet Union for a very long time. But you look at 1958 or 1956 Czechoslovakia and 68th Hungary or something, 68 Czechoslovakia, when the Soviet Union rolled in to call an uprising using tanks. Now, that's just yesterday's news. The tank is obsolete.