Vietnam War

====China====
{{See also|China in the Vietnam War}}The People's Republic of China provided significant support for North Vietnam when the U.S. started to intervene, included through financial aid and the deployment of hundreds of thousands of military personnel in support roles. China said that its military and economic aid to North Vietnam and the Viet Cong totaled $20&nbsp;billion (approx. $160&nbsp;billion adjusted for inflation in 2022) during the Vietnam War;<ref name="Womack" />{{Rp|}} included in that aid were donations of 5&nbsp;million tons of food to North Vietnam (equivalent to North Vietnamese food production in a single year), accounting for 10–15% of the North Vietnamese food supply by the 1970s.<ref name="Womack" />{{Rp|}}

In the summer of 1962, [[Mao Zedong]] agreed to supply Hanoi with 90,000 rifles and guns free of charge, and starting in 1965, China began sending [[Anti-aircraft warfare|anti-aircraft]] units and engineering battalions to North Vietnam to repair the damage caused by American bombing. In particular, they helped man anti-aircraft batteries, rebuild roads and railroads, transport supplies, and perform other engineering works. This freed North Vietnamese army units for combat in the South. China sent 320,000 troops and annual arms shipments worth $180&nbsp;million.<ref name="Qiang">{{Cite book |last=Qiang |first=Zhai |title=China and the Vietnam Wars, 1950–1975 |publisher=University of North Carolina Press |year=2000 |isbn=978-0-8078-4842-5}}</ref>{{Rp|135}} The Chinese military claims to have caused 38% of American air losses in the war.<ref name=Womack/>{{Rp|}}

The PRC also began financing the Khmer Rouge as a counterweight to North Vietnam at this time. China "armed and trained" the Khmer Rouge during the civil war, and continued to aid them for years afterward.<ref>{{Cite news |last=Bezlova, Antoaneta |date=21 February 2009 |title=China haunted by Khmer Rouge links |work=Asia Times |url=http://www.atimes.com/atimes/China/KB21Ad01.html |url-status=unfit |archive-url=https://web.archive.org/web/20090223174332/http://www.atimes.com/atimes/China/KB21Ad01.html |archive-date=23 February 2009}}</ref>