Rubuta ci gaba don wannan sakin layi - Da farko, 'yan gurguzu na Arewacin Vietnam sun kasance ƙaƙƙarfan abokin haɗin gwiwa na Khmer Rouge yayin da suke yaƙi da Jamhuriyar Khmer ta Lon Nol a lokacin yakin basasa na 1970 <unk> 1975. Sai bayan da Khmer Rouge suka karbi iko abubuwa suka fara zama mai tsanani, lokacin da a ranar 1 ga Mayu 1975 (rana bayan Saigon ya fadi)
), Sojojin Khmer Rouge sun mamaye tsibirin Phu Quoc da Tho Chau, inda suka kashe fararen hula fiye da ɗari biyar na Vietnamese; bayan harin, tsibiran sun sake dawowa da sauri ta hanyar Hanoi. Ko da a lokacin, halayen farko na Vietnamese sun kasance masu rikitarwa, kuma ya ɗauki Vietnam lokaci mai tsawo don amsawa da ƙarfi, domin abin da ya fara shi ne shirya al'amura "a cikin iyali".