of false positives, as in the case of Stanislav Petrov. Perfect attribution. If there is a launch from the Sino-Russian border, it could be difficult to distinguish which nation is responsible—both Russia and China have the capability—and, hence, against which nation retaliation should occur. A launch from a nuclear-armed submarine could also be difficult to attribute. Perfect rationality No rogue commanders will have the ability to corrupt the launch decision process. Such an incident very nearly occurred during the Cuban Missile Crisis when an argument broke out aboard a nuclear-armed submarine cut off from radio communication. The second-in-command, Vasili Arkhipov, refused to launch despite an order from Captain Savitsky to do so. All leaders with launch capability care about the survival of their subjects (an extremist leader may welcome Armageddon and launch an unprovoked attack). Winston Churchill warned that any strategy will not "cover the case of lunatics or dictators in the mood of Hitler when he found himself in his final dugout." Inability to defend No fallout shelter networks of sufficient capacity to protect large segments of the population and/or industry. No development of anti-missile technology or deployment of remedial protective gear. Terrorism The threat of foreign and domestic nuclear terrorism has been a criticism of MAD as a defensive strategy. Deterrent strategies are ineffective against those who attack without regard for their life. Furthermore, the doctrine of MAD has been critiqued in regard to terrorism and asymmetrical warfare. Critics contend that a retaliatory strike would not be possible in this case because of the decentralization of terrorist organizations, which may be operating in several countries and dispersed among civilian populations. A misguided retaliatory strike made by the targeted nation could even advance terrorist goals in that a contentious retaliatory strike could drive support for the terrorist cause that instigated the nuclear exchange. Space weapons Strategic analysts have criticized the doctrine of MAD for its inability to respond to the proliferation of space weaponry. First, military space systems have unequal dependence across countries. This means that less-dependent countries may find it beneficial to attack a more-dependent country's space weapons, which complicates deterrence. This is especially true for countries like North Korea which have extensive ballistic missiles that could strike space-based systems. Even across countries with similar dependence, anti-satellite weapons (ASATs) have the ability to remove the command and control of nuclear weapons. This encourages crisis-instability and pre-emptive nuclear-disabling strikes.