PRG meaning in Regional ?

The Provisional Revolutionary Government of the Republic of South Vietnam (Vietnamese: Chính-phủ Cách-mạng Lâm-thời Cộng-hòa Miền Nam Việt-nam, PRG), was formed on June 8, 1969, by North Vietnam as a purportedly independent shadow government that opposed the government of the Republic of Vietnam (South Vietnam) under President Nguyễn Văn Thiệu and then as a country after the Fall of Saigon with the name Republic of South Vietnam from 30 April 1975 to 2 July 1976. Delegates of the National Liberation Front of South Vietnam (the Viet Cong), as well as several smaller groups, participated in its creation.

The PRG was recognized as the government of South Vietnam by most communist states. It signed the 1973 Paris Peace Treaty as an independent entity, that was separate from both South Vietnam and North Vietnam. It became the nominal government of South Vietnam as the Republic of South Vietnam following the Fall of Saigon on 30 April 1975. On 2 July 1976, the Republic of South Vietnam and North Vietnam merged to form the Socialist Republic of Vietnam.