What are the consequences of drone proliferation for international security? Despite extensive discussions in the policy world concerning drone strikes for counterterrorism purposes, myths about the capabilities and implications of current-generation drones often outstrip reality. Understanding the impact of drones requires separating fact from fiction by examining their effects in six different contexts—counterterrorism, interstate conflict, crisis onset and deterrence, coercive diplomacy, domestic control and repression, and use by nonstate actors for the purposes of terrorism. Although current-generation drones introduce some unique capabilities into conflicts, they are unlikely to produce the dire consequences that some analysts fear. In particular, drone proliferation carries potentially significant consequences for counterterrorism operations and domestic control in authoritarian regimes. Drones could also enhance monitoring in disputed territories, potentially leading to greater stability. Given their technical limitations, however, current-generation drones are unlikely to have a large impact on interstate warfare. Assessing the consequences of drone proliferation has important implications for a range of policy issues, including the management of regional disputes, the regulation of drone exports, and defense against potential terrorist attacks on the homeland.

Peaceful nuclear cooperation—the transfer of nuclear technology, materials, or know-how from one state to another for peaceful purposes—leads to the spread of nuclear weapons. In particular, countries that receive peaceful nuclear assistance are more likely to initiate weapons programs and successfully develop the bomb, especially when they are also faced with security threats. Statistical analysis based on a new data set of more than 2,000 bilateral civilian nuclear cooperation agreements signed from 1950 to 2000 lends strong support for this argument. Brief case studies of the Indian and Pakistani nuclear weapons programs provide further evidence of the links between peaceful nuclear assistance and proliferation. The finding that supplier countries inadvertently raise the risks of nuclear proliferation poses challenges to the conventional wisdom. Indeed, the relationship between civilian nuclear cooperation and proliferation is surprisingly broad. Even assistance that is often viewed as innocuous, such as training nuclear scientists or providing research or power reactors, increases the likelihood that nuclear weapons will spread. “Proliferation-proof” nuclear assistance does not exist. With a renaissance in nuclear power on the horizon, major suppliers, including the United States, should reconsider their willingness to assist other countries in developing peaceful nuclear programs.