SPIEGEL ONLINE: Would the traditional deterrence mechanisms no longer function in that case?
Janning: They would still function for the "old" nuclear powers. These states are, and will continue to be, capable of striking any location on the Earth's surface with nuclear weapons to the extent that life can no longer exist there any more. That is not, however, the case for the "new" nuclear powers. They can only threaten an attacker with the risk of a retaliatory nuclear strike whose effect is not entirely predictable. This in itself is likely to negatively affect the so-called "extended deterrence" of today's nuclear powers. (Editor's note: Under extended deterrence, a state threatens nuclear retaliation in the event of a nuclear attack on its allies e.g. other NATO members.) In other words, America's allies can no longer be certain that a US security guarantee offers them adequate protection against a nuclear attack by third parties. Washington might, after all, decide that the cost of intervening under these conditions is just too high.