Australians.
South Vietnam was considered an ally of the US.
North Vietnam and their southern communist allies the Viet Cong verses the US, South Korea, South Vietnam, Philippines, Thailand, Australia, and New Zealand. Red China & the USSR supplied weapons and ammunition to their communist ally, North Vietnam.
It created a new enemy for the Americans during the cold war; a Soviet Union ally...Communist China (more commonly referred to as Red China in newspapers and magazines during the 1960s). During the Vietnam War, communist material that was encountered or captured which was made in Red China were tranmitted over the radio as "Chicom AK-47s, Chicom SKS carbines,..."; short for Chinese Communist. Nationalist China (Taiwan) was an American ally.
France
Great Britain was a "supportive" ally during the Vietnam War.
Fidel Castro was a Cuban leader and communist ally of the Soviet Union.
Yes, South Korea is an ally of the Republic of Vietnam. During the Vietnam War, South Korea helped the United States and the Republic of Vietnam to fight against the communists. The Republic of Vietnam was helped by South Korea, by the United States, by Thailand, by Taiwan, by New Zealand, by Australia, by Singapore and by Malaysia!
Yes
The US involvement in the Vietnam War was to rule out and hopefully stop comunism from spreading in a dominoe effect. Which were the plans of the North Vietnames, to further spread communism to South Vietnam.
Laos was neutral.
The VC were an ally.