Assad carried out Khan Sheikhoun gas attack out of frustration, the official stated.
Moti Kahana campaigning for safe zone.
The Golan Heights has recently seen a dramatic increase in spillover from battles in Syria, with eight mortar shells striking in the area in the the last month.
Now, as in 2013, Israel has stayed out of the fight, except to provide humanitarian and medical assistance to thousands of south Syria residents.
Watch: former Chief of Staff Gabi Ashkenazi casts his view on Israel's security challenges ahead of his speech at the Jpost Annual Conference.