Flying drones into each other’s airspace violated an armistice that ended fighting in the 1950-1953 Korean War, UN says.

North Korea and South Korea violated the armistice that governs their shared border by sending drones into each other’s airspace in December, the US-led United Nations Command says.

Five North Korean drones crossed into the South on December 26, prompting South Korea’s military to scramble fighter jets and helicopters

The UN Command, which has helped oversee the Demilitarized Zone (DMZ) between the two Koreas since an armistice ended fighting in the 1950-1953 Korean War,

said on Thursday that it had conducted a special investigation of the airspace incursions to determine whether there were any violations of the ceasefire.

The drone incursions by the two countries constituted violations, but South Korea’s efforts to shoot down the drones in its airspace did not violate the armistice, the UN Command said in a statement.

Seoul and Pyongyang remain technically at war because no permanent peace treaty has ever been reached to end the Korean War.