ISIS hasn’t attacked Israel, yet. Israel does “tit-for-tat.”
So, ....when did Assad attack Israel?
Syria has fought Israel multiple times:
https://en.m.wikipedia.org/wiki/Israel%E2%80%93Syria_relations
Israel and Syria are still in a state of war; they just don’t act on it, like I guess, the US, South Korea vs. North Korea.
” The two countries have since the establishment of the State of Israel been in a state of war.”
https://en.wikipedia.org/wiki/Israel%E2%80%93Syria_relations
But what does this mean? Little really.
“Since 2004, Israel has exported apples to Syria through the Quneitra crossing. In 2010, some 10,000 tons of apples grown by Druze farmers in the Golan Heights were sent to Syria.[8] Israeli minister Ayoub Kara called for an agreement with Syria over the supply of water to towns in the Golan Heights.”
Anyway, Israel has struck in Syria about 10 times in 2 years, there is some sort of data on it and every few months, something like this happens.
Surely, Hezbollah who fired hundreds of missiles into Israel and Hamas get aid from Iran, probably Syria too. So, it’s a two-way street.