“The military identified at least five North Korean drones, each 6 ½ feet long, flying in South Korean airspace, army Gen. Lee Seung Oh said in a statement to reporters…South Korea’s military scrambled fighters, helicopters and other aircraft to respond to the drones…
Oh said South Korea also took ‘corresponding measures’ by deploying drones north of the Military Demarcation Line, the border between the two countries, to film the North’s military facilities.”
During the response a RoK KA-1 CAS prop aircraft crashed on take-off from Osan AFB.
Source: South Korea responds in force to North Korean drone intrusion near Seoul | Stars and Stripes