People's Republic of Kampuchea
The K5 Plan (), K5 Belt or K5 Project, also known as the Bamboo Curtain, was an attempt between 1985 and 1989 by the government of the People's Republic of Kampuchea to seal Khmer Rouge guerrilla infiltration routes into Cambodia by means of trenches, wire fences, and minefields along virtually the entire Thai–Cambodian border.