The Federation of South Arabia and the Protectorate of South Arabia merged to become the People's Republic of Southern Yemen on 30 November 1967 and later changed its name to the People's Democratic Republic of Yemen. It became a Marxist–Leninist one-party state in 1969 and was supported by Cuba, East Germany and the Soviet Union. It was the only communist state to be established in the Arab world. Despite its efforts to bring stability into the region, it was involved in a brief civil war in 1986. With the collapse of communism, South Yemen was unified with the Yemen Arab Republic, commonly known as "North Yemen," on 22 May 1990 to form the present-day Republic of Yemen. After three years, however, a political crisis arose between the South's YSP and the North's GPC and Islah parties after the parliamentary elections in 1993. South Yemen declared its secession from the North Yemen in 1994; the new unrecognised secessionist state, the Democratic Republic of Yemen, ended with its dissolution and North Yemen occupying South Yemen after the 1994 civil war. Another attempt to restore South Yemen, as only a country, not as a socialist state, with the Southern Transitional Council as its new government, began in 2017 and had continued ever since.