US Atomic Energy Intelligence Against the Soviet Target, 1945-1970

Throughout the Cold War, the United States and its allies mounted a massive atomic energy intelligence effort against the Soviet Union. Long-range, standoff technical systems provided the most data and allowed for successful tracking of many aspects of the Soviet nuclear program. Because of the closed nature of Soviet society and Soviet security and counter-intelligence measures, exploitation of open sources and traditional espionage operations, although important, were less productive. The relative lack of human intelligence made it difficult to understand important developments inside the Soviet nuclear complex and resulted in significant intelligence gaps.