EXECUTIVE SUMMARY: Israel has neither the power nor the motivation to significantly influence the outcome of the war for control of all the pieces of Syria. Israel’s objective in Syria is to prevent Iran from building military facilities there that increase its ability to attack Israel. The only way Israel can achieve this is by destroying any such facilities that Iran builds, or by convincing Iran not to build any threatening facility out of fear that Israel will destroy it.
There is little Israel could do to affect the outcome of the struggle for control of Syria and its component parts. Jerusalem does not have any strong preferences among the likely alternative outcomes, all of which are bad for Israel. (For humanitarian reasons Israel would like the bloody attacks on civilians to stop, but Israel’s security benefits so long as its enemies are fighting with each other.)
Jerusalem’s main practical interests in Syria are to prevent construction of military facilities there that would increase Iran’s ability to attack Israel, and to prevent Iran from controlling territory near the Golan Heights.