Der Spiegel - January 17, 2012

From the story:
For Israel, the question of whether Iran will possess nuclear weapons is a matter of existential significance. Such a bomb would constitute a threat to the Jewish state – as well as to Palestinians in the West Bank and the Gaza Strip. Should Israel’s shadow war be credited with reducing the chances of such an Armageddon.
Israel certainly has extensive experience in the world of covert warfare. Mossad, the country’s foreign intelligence agency, abides by the Talmudic precept: “If a man comes to kill you, rise early and kill him first.”
Meir Dagan, the much-honored former head of Mossad, retired late last year after eight years in office. Former Prime Minister Ariel Sharon named Dagan to be supreme commander in Israel’s covert war against Iran’s nuclear ambitions, and Dagan concentrated his attention on precisely this mission.