After 1975, although completely liberated and united, Vietnam entered a very difficult period, surrounded, economically embargoed, and politically and diplomatically isolated. This period has left many opposite impacts on the construction and defense of the country, exacerbating the socio-economic crisis in Vietnam. In 1986, with the renovation policy of the Sixth Party Congress, it has initially opened the possibility for the country to escape the situation of being surrounded, embargoed and isolated. Thanks to the right course, Vietnam has integrated internationally and achieved great socio-economic results. The content of this book discusses Vietnam-international relations; Vietnam's policies after 1975 to the mid-1990s; process of escaping the situation of being surrounded, embargoed, isolated; draw meaningful lessons in foreign affairs.