Until someone calls your bluff, perhaps accidentally, and realizes much of the nuclear saber-rattling was just that. Of course, since it wasn't entirely a bluff

Until someone calls your bluff, perhaps accidentally, and realizes much of the nuclear saber-rattling was just that. Of course, since it wasn't entirely a bluff, this is the easiest way to get a nuclear war going. (Get a country with nukes but limited conventional capabilities into a brinksmanship contest.)