Saudi Arabia and Oman had earlier clashed over ownership of the Buraimi Oasis .
The Saudi Arabia had already supported two failed insurrections in the Jebel Akhdar in the interior of Oman in 1957 -- 59 .
Saudi Arabia and Oman had earlier clashed over ownership of the Buraimi Oasis , and the Saudis had already supported two failed insurrections in the Jebel Akhdar in the interior of Oman in 1957 -- 59 .