of vast reserves of oil in the 1930s. Its production brought great wealth to all countries of the region, with the exception of Yemen. North Yemen Civil War The North Yemen Civil War was fought in North Yemen between royalists of the Mutawakkilite Kingdom of Yemen and factions of the Yemen Arab Republic from 1962 to 1970. The war began with a coup d'état carried out by the republican leader, Abdullah as-Sallal, which dethroned the newly crowned Muhammad al-Badr and declared Yemen a republic under his presidency. The Imam escaped to the Saudi Arabian border and rallied popular support. The royalist side received support from Saudi Arabia, while the republicans were supported by Egypt and the Soviet Union. Both foreign irregular and conventional forces were also involved. The Egyptian President, Gamal Abdel Nasser, supported the republicans with as many as 70,000 troops. Despite several military moves and peace conferences, the war sank into a stalemate. Egypt's commitment to the war is considered to have been detrimental to its performance in the Six-Day War of June 1967, after which Nasser found it increasingly difficult to maintain his army's involvement and began to pull his forces out of Yemen. By 1970, King Faisal of Saudi Arabia recognized the republic and a truce was signed. Egyptian military historians refer to the war in Yemen as their Vietnam. Gulf War In 1990, Iraq invaded Kuwait. The invasion of Kuwait by Iraqi forces led to the 1990–91 Gulf War. Egypt, Qatar, Syria and Saudi Arabia joined a multinational coalition that opposed Iraq. Displays of support for Iraq by Jordan and Palestine resulted in strained relations between many of the Arab states. After the war, a so-called "Damascus Declaration" formalized an alliance for future joint Arab defensive actions between Egypt, Syria, and the GCC member states. 2014 Yemen civil war The Arab Spring reached Yemen in January 2011. People of Yemen took to the street demonstrating against three decades of rule by President Ali Abdullah Saleh. The demonstration led to cracks in the ruling General People's Congress (GPC) and Saleh's Sanhani clan. Saleh used tactics of concession and violence to save his presidency. After numerous attempts, Saleh accepted the Gulf Cooperation Council's mediation. He eventually handed power to Vice President Hadi, who was sworn in as President of Yemen on 25 February 2012. Hadi launched a national dialogue to address new constitutional, political and social issues.