Haɗa matsalolin tattalin arziki sabbin ƙalubalen soja ne.A ƙarshen 1970s, Cambodia a ƙarƙashin gwamnatin Khmer Rouge ta fara cin zarafi da kai hare-hare a ƙauyukan Vietnam a kan iyakar gama gari.A ƙarshen 1978, shugabannin Vietnam sun yanke shawarar cire gwamnatin Khmer Rouge ta Democratic Kampuchea, suna la'akari da ita a matsayin mai goyon bayan Sinawa da ƙiyayya ga Vietnam.A ranar 25 ga Disamba 1978, sojojin Vietnam 150,000 suka mamaye Kampuchea Democratic Kampuchea kuma suka mamaye sojojin Kampuchean Revolutionary Army a cikin makonni biyu kacal, wanda hakan ya kawo karshen gwamnatin Pol Pot, wacce ke da alhakin mutuwar kusan kwata na dukkan Cambodia tsakanin 1975 zuwa Disamba 1978 a lokacin Cambodia. kisan kare dangi.Shishigin sojan Vietnam, da kuma taimakon da sojojin mamaya suka yi na taimakon abinci na kasa da kasa don rage yawan yunwa, sun kawo karshen kisan kiyashin.^[220]A ranar 8 ga Janairun 1979 an kafa Jamhuriyar Jama'ar Kampuchea Pro-Vietnamese (PRK) a Phnom Penh, wanda ke nuna farkon mamayar Vietnam na shekaru goma.A wannan lokacin, Majalisar Dinkin Duniya ta ci gaba da amincewa da Jamhuriyar Khmer Rouge ta Democratic Kampuchea a matsayin halaltacciyar gwamnatin Kampuchea, yayin da aka kafa kungiyoyin gwagwarmaya da dama don yaki da mamayar Vietnam.A tsawon wannan rikici, waɗannan ƙungiyoyi sun sami horo a Thailand daga Ma'aikatar Sojan Sama na Musamman na Sojojin Burtaniya.^{[221 <>]} A bayan fage, Firayim Minista Hun Sen na gwamnatin PRK ya tunkari ƙungiyoyin gwamnatin haɗin gwiwar Democratic Kampuchea (CGDK) don fara tattaunawar zaman lafiya.A karkashin matsin lamba na diflomasiyya da na tattalin arziki daga kasashen duniya, gwamnatin Vietnam ta aiwatar da wasu sauye-sauye na tattalin arziki da na ketare, sannan ta fice daga Kampuchea a watan Satumban shekarar 1989.