Interview given by H.E. President Bashar al-Assad to Foreign Affairs Magazine, January 26th, 2015.
http://www.presidentassad.net/index.php?option=com_content&view=article&id=1423:interview-given-by-h-e-president-bashar-al-assad-to-foreign-affairs-magazine-january-26th-2015&catid=314&Itemid=468
"Question 26: So what do you think Israel’s agenda is?
President Assad: They are supporting the rebels in Syria. It’s very clear. Because whenever we make advances in some place, they attack in order to undermine the army. It’s very clear. That’s why some in Syria joke, how can you say that al Qaeda doesn’t have an air force? They have the Israeli air force."