By Peter Bergen, CNN National Security analyst, and Jennifer Rowland, Special to CNN
A decade ago, the United States had a virtual monopoly on drones.
Not anymore. According to data compiled by the New America Foundation, more than 70 countries now own some type of drone, though just a small number of those nations possess armed drone aircraft.
The explosion in drone technology promises to change the way nations conduct war and threatens to begin a new arms race as governments scramble to counterbalance their adversaries.
Late last month, China announced that it would use surveillance drones to monitor a group of uninhabited islands in the South China Sea that are controlled by Japan but claimed by China and Taiwan.