The Yemen Arab Republic (YAR; Arabic: الجمهورية العربية اليمنية al-Jumhūrīyah al-‘Arabīyah al-Yamanīyah), also known as North Yemen or Yemen (Sana'a), was a country from 1962 to 1990 in the northwestern part of what is now Yemen. Its capital was at Sana'a. It united with the People's Democratic Republic of Yemen, commonly known as South Yemen, on May 22, 1990, to form the current Republic of Yemen.
Following the collapse of the Ottoman Empire, northern Yemen became an independent state as the Mutawakkilite Kingdom of Yemen. On 27 September 1962, revolutionaries inspired by the Arab nationalist ideology of United Arab Republic (Egyptian) President Gamal Abdel Nasser deposed the newly crowned King Muhammad al-Badr, took control of Sana'a, and established the Yemen Arab Republic (YAR). This coup d'état marked the beginning of the North Yemen Civil War that pitted YAR troops assisted by the United Arab Republic (Egypt) while Saudi Arabia and Jordan supported Badr's royalist forces opposing the newly formed republic. Conflict continued periodically until 1967 when Egyptian troops were withdrawn. By 1968, following a final royalist siege of Sana'a, most of the opposing leaders reached a reconciliation; Saudi Arabia recognized the Republic in 1970.
Unlike East and West Germany or North and South Korea, the YAR and its southern neighbour, the People's Democratic Republic of Yemen (PDRY), also known as South Yemen, 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.