China tended to have really bad foreign policy following the split. They started viewing the USSR and by extension Vietnam as really large threats, and this was reflected in their Cambodia stance. They didn’t want another pro-soviet country in their vicinity.
As for Cambodia itself, North Vietnamese troops actually trained Khmer Rouge soldiers before they took power, so perhaps even they thought at first that they were comitted to the socialist path. Nevertheless, Vietnam liberated them later on.
China tended to have really bad foreign policy following the split. They started viewing the USSR and by extension Vietnam as really large threats, and this was reflected in their Cambodia stance. They didn’t want another pro-soviet country in their vicinity.
As for Cambodia itself, North Vietnamese troops actually trained Khmer Rouge soldiers before they took power, so perhaps even they thought at first that they were comitted to the socialist path. Nevertheless, Vietnam liberated them later on.