Israel has been helping al-Qaeda make gains in southern Syria

"The rebels’ battle, led by al-Qaeda’s affiliate Jabhat al-Nusra, to control the Quneitra crossing took place in coordination with the Israeli army through Abu Dardaa, according to Qasim. He added, “During the clashes, the Israelis heavily bombarded many of the regime’s posts, shot down a warplane that was trying to impede the progress of the fighters and targeted other aircraft.” The media reported that on Sept. 23, Israel downed a MiG-21 Syrian military aircraft over the occupied Golan Heights during the intensification of fighting between rebel fighters led by Jabhat al-Nusra and the Syrian army." (thanks Ali)