The USSR and Red China.
Yes, and the more they could get, the more they wanted.
Cong is short for Viet Cong. The Viet Cong were the communist guerrilla forces backed by North Vietnam when they fought against South Vietnam during the Vietnam War.
Before reunification, Vietnam was divided into North Vietnam and South Vietnam. North Vietnam had a Sino-Soviet backed Communist government, while South Vietnam had a Western-backed Democratic government (at least in principle). Prior to the division of North and South Vietnam, it was subject to a French colonial government, whose control of the region was interrupted during WWII, when a Japanese occupational government controlled the region.
Vietcong
North Korea & North Vietnam.
In the past. yes. As two countries were both separated into two parts. North Vietnam & North Korea were both backed up by Soviet Union and China while South Vietnam and South Korea were backed up by the United States. Then Vietnam reunified in April 1975 while Korea has never been able to reunify ever since the separation. Vietnam and Korea shares a lot of similar traits in culture and tradition. Currently, South Korea is the 15th largest economy in the world, Vietnam is the 56th, North Korea is the 125th.
The countries that were actually "physically" involved, and were bombed or had US aircraft crash into them, whether they were "officially" in the war or not, were: Lao's, Cambodia, North Vietnam and South Vietnam.
Vietnam was split into two countries during the vietnam war, the north was ruled by Ho Chi Minh and the South by Ngo Diem.
During the Vietnam War, all combatants (including North Vietnam) used draftees except for the New Zealanders, they sent volunteers to South Vietnam.
The US supported resistance to communism, so it backed the faction in the South, while Russia and China backed the faction in the North. The same had occurred earlier with North and South Korea. South Vietnam became a nominal democracy but an unpopular authoritarian regime, and after the US withdrew its aid, it was overrun by the forces of North Vietnam in 1975.
The countries to west of Vietnam are Laos and to the southwest Cambodia. China borders at the north.
North Vietnam/VC vs allies