Experts are urging the government to officially protest against North Korea after two drones that recently crashed in Paju, Gyeonggi Province and Baeknyeong Island are believed to have come from North Korea.
This represents a violation of the Convention on International Civil Aviation, also known as the Chicago Convention.
In a telephone interview with the Chosun Ilbo on Wednesday, Shin Sung-hwan, a professor emeritus of the Korea Air Force Academy, said, "As members of the International Civil Aviation Organization, the two Koreas should respect the sovereignty of each other's airspace in accordance with Article 3 of the Chicago Convention."
"Any aircraft, manned or unmanned, should follow appropriate procedures if they enter the airspace of another country," he added.
The Chicago Convention stipulates, "No state aircraft of a contracting State shall fly over the territory of another State or land thereon without authorization."
It is generally believed that unmanned aircraft are also subject to this stipulation.
"We should lodge strong protest against the North over the drones' intrusion of our airspace," Shin said. "Taking countermeasures, including the installation of more radar facilities, is a second priority."