Unification

Unlike East Germany and West Germany or North Korea and South Korea, the northern Yemen Arab Republic (YAR) and the PDRY remained relatively friendly, though relations were often strained. In 1972 it was declared unification would eventually occur.
However, these plans were put on hold in 1979, and war was only prevented by an Arab League intervention. The goal of unity was reaffirmed by the northern and southern heads of state during a summit meeting in Kuwait in March 1979.
In 1980, PDRY president Abdul Fattah Ismail resigned and went into exile. His successor, Ali Nasir Muhammad, took a less interventionist stance toward both North Yemen and neighbouring Oman. On January 13, 1986, a violent struggle began in Aden between Ali Nasir's supporters and supporters of the returned Ismail, who wanted power back. Fighting lasted for more than a month and resulted in thousands of casualties, Ali Nasir's ouster, and Ismail's death. Some 60,000 people, including the deposed Ali Nasir, fled to the YAR. Ali Salim al-Beidh, an ally of Ismail who had succeeded in escaping the attack on pro-Ismail members of the Politburo, then became General Secretary of the Yemeni Socialist Party.
In May 1988, the YAR and PDRY governments came to an understanding that considerably reduced tensions including agreement to renew discussions concerning unification, to establish a joint oil exploration area along their undefined border, to demilitarize the border, and to allow Yemenis unrestricted border passage on the basis of only a national identification card.