What can Israel do about the S-300?

One of my Twitter trolls issued a challenge today, saying that if Assad has the S-300, why isn't Israel hitting him? (Note that I do not respond to Twitter trolls with less than about 1,000 followers on Twitter - it's not worth giving them the exposure). But there are several answers to that question. One is that the fact that Assad says he has the S-300 doesn't mean he has the S-300. In fact,