The Chinese made landmines in Cambodia were placed by the Cambodian factions (including the Lon Nol, Khmer Rouge, the United States, the Heng Samrin and Hun Sen regimes, as well as the Coalition Government of Democratic Kampuchea who, with international support retained the UN seat throughout much of the 1980s) which clashed during the Civil War in Cambodia in the 1970s and 1980s. They were placed in the whole territory of the country. A common problem Cambodians faced with the anti-personnel mines is that often even the people who placed the mines do not remember them a couple of years later.