After 9/11, Kasparov talked about making an example "from Tehran to Mecca" and even using nukes. He's worth listening to regarding Putin/Russia, but for Israel-Palestine and the middle-east in general...not so much. Last i read him talking about it in an interview (maybe five years ago roughly) he still thought the Iraq War was justified!.
I would agree with this. At least on Russia, he has some degree of lived experience on the subject matter.