The Khmer Republic was a Cambodian state under the United States-backed military dictatorship of Marshal Lon Nol from 1970 to 1975. Its establishment was formally declared on 9 October 1970, following the 18 March 1970 coup d'état which led to the overthrow of Norodom Sihanouk's government and the subsequent abolition of the federalist Cambodian monarchy in favour of a centralised republic. After the coup, Sihanouk fled to Pyongyang and later Beijing in exile.
Source:Wikipedia — Khmer Republic →