They were both separate neutral nations during the war.
Vietnam and Cambodia
Cambodia was officially neutral during the war.
Cambodia was being invaded by both American and japenesse troops during their battles.
The Japanese occupied French Indochina (now separated into Vietnam, Laos & Cambodia) during the Second World War.
Laos and Cambodia.
During the Vietnam War, the war spilled over to Cambodia.
There are large tracts of forest in Cambodia, despite the deforestation campaigns waged on Cambodia during the American(vietnam)war. During the Vietnam War, there were many forests in Cambodia, Laos and South Vietnam. Only Airmen can report on forests for North Vietnam (they're the only ones that got to observe them).
Vietnam and Cambodia
Cambodia was officially neutral during the war.
During the poopy war.
Cambodia was being invaded by both American and japenesse troops during their battles.
The Japanese occupied French Indochina (now separated into Vietnam, Laos & Cambodia) during the Second World War.
Laos and Cambodia.
With the exception of air strikes, which occurred in four countries (N & S Vietnam, Cambodia, and Lao's), the ground fighting between conventional forces all occurred within South Vietnam, with the exception of President Nixon's invasion (incursion) of Cambodia in 1970 and Lao's in 1971.
The bordering countries of Laos & Cambodia were neutral.
The credibility gap
Cambodia was officially neutral during the war.