But technology has not remained static over the half-century since the end of the fighting, and now South Korea is researching new ways to counter North Korean drones. One of their answers: Nets.

Drones fighting drones is an idea that's seen a recent surge in popularity, as governments and security agencies figure out how exactly to stop the small flying machines. One idea is Rapere, which would use a fast interceptor drone to drop wires on hostile quadcoptor rotors. In France, Malou Tech is developing two types of anti-drone drones: one is small kamikaze quadcopter that disables enemy drones by crashing into them; the other is a larger, net-carrying drone, which snags other flying craft from the sky like fish in the sea. Last month, Dutch company Delft Dynamics took the idea a step further, with a drone that launched a net from a cannon at another drone.