Cambodia, in 1970, had a coup.
Documents uncovered from the Soviet archives after 1991 reveal that the North Vietnamese attempt to overrun Cambodia in 1970 was launched at the explicit request of the Khmer Rouge and negotiated by Pol Pot's then second in command, Nuon Chea
 Although constitutionally a multi-party state, the CPP dominates the political system and dissolved its main opposition party in 2017, making Cambodia a de facto one-party state

