I agree, pouring concrete won't solve the problem. The paranoid Peoples Liberation Army Air Force should fly their MiG 17 copies in 'corridors' (this how most other air forces operate) and should relinquish airspace to enable common, coordinated arrivals into the PRD airports.
But the cousins up north will never progress while they think the whole world is out to get them and the military holds sway over economic development. The 'glass wall' will be there for generations to come.