Third Indochina War

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Third Indochina War
Part of the Indochina Wars and the Cold War
Date1 May 1975 – 23 October 1991
(16 years, 5 months, 3 weeks and 1 day)

Democratic Kampuchea

Lao royalists
Hmong insurgents
Flag of FULRO.svg FULRO

Supported by:
 United States
 North Korea[1]

Laos Laos
People's Republic of Kampuchea People's Republic of Kampuchea
Communist Party of Thailand

  • Pak Mai
Supported by:
Warsaw Pact Logo.svg Warsaw Pact countries (until 1991) [1]
Casualties and losses
Unknown Vietnam:
105,627 military deaths[2]

The Third Indochina War was a series of interconnected armed conflicts, mainly among the various communist factions over strategic influence in Indochina after United States withdrawal in 1973 and Communist victory in South Vietnam, Laos and Cambodia in 1975.[3] The complete American withdrawal instantaneously eliminated the principal and common adversary of all the communist powers.[4] Ever more diverging Chinese and Soviet strategic and political doctrines had increased the Sino-Soviet split of the mid-1950s. The local communist regimes of Cambodia, Vietnam and Laos pledged allegiance with one of these two opposing factions. The ensuing hostilities were fuelled by century-old animosities between Vietnam and Cambodia, and – particularly – Vietnam and China.[5]

In 1975 initial military engagements arose between communist Vietnam and the Cambodian Khmer Rouge regime, which resulted in the Vietnamese occupation of Cambodia for over a decade. The Vietnamese push to completely destroy the Khmer Rouge unavoidably brought them into open conflict with Thailand.[6][7]

China had hardly opposed Vietnam's active role in the suppression of the anti-communist Insurgency in Laos, however it strongly objected to the invasion of Cambodia. Chinese armed forces launched a punitive operation in February 1979 and attacked Vietnam's northern provinces, determined to contain Soviet/Vietnamese influence and prevent territorial gains in the region.[8][9]

In order to acquire full control over Cambodia the People's Army of Vietnam needed to dislodge the remaining Khmer Rouge leaders and units, which had retreated to the remote areas along the Thai-Cambodian border.[10] The situation escalated as Thailand's territorial sovereignty was violated on numerous occasions. Heavy fighting with many casualties resulted from direct confrontations between Vietnamese and Thai troops. Thailand increased troop strength, purchased new equipment and built a diplomatic front against Vietnam, and China.[4] After the Paris Peace Conference in 1989, the NVA withdrew from Cambodian territory. Finally regular troop engagements in the region ended after the conclusion of the 1991 Paris Peace Accords.[11][12]


Soviet-Chinese discord[edit]

After Joseph Stalin's death in 1953,[13] Nikita Khrushchev became leader of the Soviet Union. His denouncement of Stalin and his purges, the introduction of more moderate communist policies and foreign policy of peaceful coexistence with the West angered China's leadership. Mao Zedong had been following a strict Stalinistic course, that insisted on the cult of personality as a unifying force of the nation. Disagreements over technical assistance for developing China's nuclear weapons and basic economic policies further alienated the Soviets and the Chinese as opposing forces of communist influence across the globe. As decolonization movements began to pick up speed in the 1960s and many such countries descended into violence, both of the communist powers competed for political control of the various nations or competing factions in ongoing civil war fights.[14]

Political developments during the Vietnam War[edit]

The Democratic Republic of Vietnam, which had chosen to ally with the USSR, justified incursions into neighbouring Laos and Cambodia during the Second Indochinese War with the international nature of communist revolution, where "Indochina is a single strategic unit, a single battlefield" and the Vietnam People's Army's pivotal role in bringing this about.[15] However, this internationalism was obstructed by complicated regional historical realities, such as the "timeless oppositions between the Chinese and the Vietnamese on the one hand and the Vietnamese and the Khmers on the other".[16] Vietnam interfered into the civil war between the Royal Lao Army and the communist Pathet Lao until the establishment of the Lao People's Democratic Republic and the "Treaty of Friendship and Cooperation" signed in July 1977. Permanently stationed troops secured and maintained vital supply routes and strategic staging sites (Ho Chi Minh trail).[15] From 1958 on Northern and Southern Vietnamese combat troops also began to infiltrate the remote jungles of eastern Cambodia where they continued the Ho Chi Minh trail. The Cambodian communist insurgents had joined these sanctuaries during the late 1960s. Although co-operation took place, the Khmer communists did not adopt modern socialist doctrines and eventually allied with China.[17][18]

Vietnamese invasion of Cambodia[edit]

The Khmer Rouge killed between 1.6 and 1.8 million Cambodians during the Cambodian Genocide. The Khmer Rouge also invaded Ba Chúc, Vietnam and massacred 3,157 Vietnamese civilians, which prompted Vietnam to invade Cambodia and overthrow the regime.

After the Fall of Saigon and Phnom Penh in April and May 1975 and the subsequent communist takeover in Laos five months later, Indochina was dominated by communist regimes. Armed border clashes between Cambodia and Vietnam soon flared up and escalated as Khmer Rouge forces advanced deep into Vietnamese territory, raided villages and killing hundreds of civilians. Vietnam counter attacked and in December 1978, NVA troops invaded Cambodia, reaching Phnom Penh in January 1979 and arriving at the Thai border in spring 1979.[19][3]

However, as China, the U.S. and the majority of the international community opposed the Vietnamese campaign, the remaining Khmer Rouge managed to permanently settle in the Thai-Cambodian border region. In a United Nations Security Council meeting, seven non-aligned members drafted a resolution for a ceasefire and Vietnamese withdrawal which failed due to opposition from the Soviet Union and Czechoslovakia. Thailand tolerated the presence of the Khmer Rouge on its soil as they helped to contain the Vietnamese and Thai domestic guerillas. Over the course of the following decade, the Khmer Rouge received considerable support from Vietnam's enemies and served as a bargaining tool in the Realpolitik of Thailand, China, the ASEAN and the U.S.[20][11]

Vietnamese border raids in Thailand[edit]

Khmer Rouge forces operated from inside Thai territory attacking the pro-Hanoi People's Republic of Kampuchea's government. Similarly Vietnamese forces frequently attacked the Khmer Rouge bases inside Thailand. Eventually Thai and Vietnamese regular troops clashed on several occasions during the following decade.[21]

Sino–Vietnamese conflicts[edit]

China attacked Vietnam in response to Vietnam's occupation of Cambodia, entered northern Vietnam and captured several cities near the border. On March 6, 1979, China declared that their punitive mission had been successful and withdrew from Vietnam. However, both China and Vietnam claimed victory. The fact that Vietnamese forces continued to stay in Cambodia for another decade implies that China's campaign was a strategic failure. On the other hand, the conflict had proven that China had succeeded in preventing effective Soviet support for its Vietnamese ally.[22][23]

As forces remained mobilized, the Vietnamese Army and the Chinese People's Liberation Army engaged in another decade-long series of border disputes and naval clashes that lasted until 1990. These mostly local engagements usually wore out in prolonged stand-offs, as neither side achieved any long-term military gains. By the late 1980s the Vietnamese Communist Party's (VCP) began to adopt its Doi Moi (renovation) policy and reconsider its China policy in particular. Prolonged hostile relations with China had been recognized as to be detrimental to economic reforms, national security and the regime's survival. A number of political concessions opened the way for the normalization process of 1991.[24]

Further conflicts[edit]

See also[edit]


  1. ^ a b Spencer C. Tucker, Encyclopedia of the Vietnam War: A Political, Social, and Military History, p.155
  2. ^ Chuyên đề 4 CÔNG TÁC TÌM KIẾM, QUY TẬP HÀI CỐT LIỆT SĨ TỪ NAY ĐẾN NĂM 2020 VÀ NHỮNG NĂM TIẾP THEO,ản%20lý%20chỉ%20đạo/Chuyên%20đề%204.doc
  3. ^ a b "Vietnam War - Facts, information and articles about The Vietnam War". HistoryNet. Retrieved March 31, 2018.
  4. ^ a b William S. Turley, Jeffrey Race (1980). "The Third Indochina War". Foreign Policy (38): 92–116. JSTOR 1148297.
  5. ^ "Chinese Communist Party: The Leaders of the CPSU are the Greatest Splitters of Our Times". Modern History Sourcebook. Fordham University. February 4, 1964. Retrieved March 11, 2018.
  6. ^ Kelvin Rowley. "Second Life, Second Death: The Khmer Rouge After 1978" (PDF). Swinburne University of Technology. Retrieved March 11, 2018.
  7. ^ "1978-1979 - Vietnamese Invasion of Cambodia". GlobalSecurity. Retrieved March 11, 2018.
  8. ^ Bernard K. Gordon (September 1986). "The Third Indochina Conflict". Foreign Affairs (Fall 1986). Retrieved March 11, 2018.
  9. ^ "The 1979 campaign" (PDF). All Partners Access Network. Retrieved March 31, 2018.
  10. ^ "Viets shell Cambodian positions..." January 2, 1985. Retrieved March 11, 2018.
  11. ^ a b Lucy Keller. "UNTAC in Cambodia – from Occupation, Civil War and Genocide to Peace - The Paris Peace Conference in 1989" (PDF). Max-Planck-Institut für ausländisches öffentliches Recht und Völkerrecht. Retrieved March 31, 2018.
  12. ^ "Cambodia - 20 years on from the Paris Peace Agreements". OHCHR. October 21, 2011. Retrieved March 31, 2018.
  13. ^ "Joseph Stalin dies - Mar 05, 1953 -". Retrieved April 24, 2017.
  14. ^ Harry Powell. "Chinese Communist Critiques of Soviet Society". Encyclopedia of Anti-Revisionism. Retrieved March 11, 2018.
  15. ^ a b Carlyle A. Thayer. "SECURITY ISSUES IN SOUTHEAST ASIA: THE THIRD INDOCHINA WAR". SCRIBD. Retrieved March 31, 2018.
  16. ^ Christopher E. Goscha. "Vietnam, the Third Indochina War and the meltdown of Asian internationalism, p. 161" (PDF). UQAM - Université du Québec à Montréal. Retrieved March 31, 2018.
  17. ^ William S. Turley (October 17, 2008). The Second Indochina War: A Concise Political and Military History. ISBN 9780742557451. Retrieved March 31, 2018.
  18. ^ "America's Vietnam War in Indochina War in Cambodia". US History. Retrieved March 31, 2018.
  19. ^ Kevin Doyle (September 14, 2014). "Vietnam's forgotten Cambodian war". BBC News. BBC. Retrieved March 31, 2018.
  20. ^ Ted Galen Carpenter. "U.S. Aid to Anti-Communist Rebels: The "Reagan Doctrine" and Its Pitfalls" (PDF). Cato Institute. Retrieved March 31, 2018.
  21. ^ "Vietnam, Thai clash continues". Star News. June 25, 1980. Retrieved March 31, 2018.
  22. ^ "The Third Indochina War". Global Security. Retrieved March 11, 2018.
  23. ^ Elleman, Bruce A. (2001). Modern Chinese Warfare, 1795-1989. Routledge. p. 297. ISBN 978-0415214742.
  24. ^ Le Hong Hiep (June 26, 2013). "Vietnam's Domestic–Foreign Policy Nexus: Doi Moi, Foreign Policy Reform, and Sino Vietnamese Normalization". Asian Politics & Policy. 5 (3): 387–406. doi:10.1111/aspp.12035.