Whakaotihia te rerenga e whai ake nei: I te Pakanga Sino-Vietnamese o te tau 1979, i kii te kaiarahi o Haina a Deng Xiaoping ki te United States ko tana mahere ki te whawhai ki nga Vietnamese he utu mo te riri a Vietnam
te whakakahoretanga o te kāwanatanga Khmer Rouge o Cambodia, he hoa o Haina. Heoi, i tohe nga mana whenua Hainamana ko te mea pono "casus belli" ko te maimoatanga kino a Vietnam ki tana iwi Hainamana, me te whakapae o Vietnam e ngana ana ki te whakakotahi i a Cambodia me te tautoko a te Soviet.