Assassination is sort of the mossad's thing. I highly recommend the book "Rise and Kill First" (by an Israeli journalist Ronen Bergman) who describes this approach to international relations as something approaching an addiction. He alleges they've assassinated more people than any country on earth since their founding in 1948 and lays out a very convincing picture (to the extent he can—there are moments when you can tell he would like to state things more baldly).