In 1988 a classified Vietnamese Ministry of Public Security’s in-house professional journal published this article offering ideas on how to utilize the “psychological characteristics” of the ethnic Chinese in the interrogation of suspected “Chinese spies”.  At the time the article was published, the once-close alliance between the Vietnamese and Chinese Communist Parties, which Mao Zedong described in 1967 as being “as close as between lips and teeth”, had deteriorated into a vicious military and political conflict between the two former allies.  Chinese efforts to collect intelligence on and to foment internal opposition against the leadership of the Vietnamese Communist Party were of special concern to Vietnam’s security service, and ethnic Chinese residents of Vietnam naturally became a primary focus of Vietnam’s counter-espionage efforts.

This article, published in a classified Vietnamese Ministry of Interior publication, asserted that Vietnam’s economy required international cooperation and support, saying “no country can close its doors and still expect to be able to develop and make progress.” The article also states that the Ministry was now gradually allowing identified “spies” to enter Vietnam so that their activities could be covertly surveilled by the Ministry’s counter-espionage officers

Trần Quốc Hoàn reviews cases against foreign and domestic spies in the Vietnam Wars.

The CIA’s National Intelligence Daily for Friday, 28 June 1991 describes the latest developments in Yugoslavia, USSR, Algeria, Egypt and Vietnam.

The CIA’s National Intelligence Daily for 31 July 1990 describes the latest developments in Japan, the Soviet Union, European Community, Liberia, Islamic States, Egypt, Fiji and Vietnam.

Zhou Enlai meets with the head of a Vietcong delegation, Nguyen Van Hieu. The two discuss the Vietcong's struggle inside of Vietnam and the organization's international ties, as well as disarmament and Afro-Asian politics.