A North Korean drone entered the northern end of a no-fly zone surrounding South Korea’s presidential office in Seoul when it intruded into the South’s airspace last week, the South’s military said on Thursday. The drone was among five North Korean drones that crossed into the South on Dec. 26, prompting South Korea’s military to scramble fighter jets and attack helicopters. The military was unable to bring down the drones, which flew over the South for hours.
