Time for that decision is fast running out and the mood in Jerusalem is hardening.
continues to enrich uranium in defiance of international pressure, saying it needs the fuel for its civilian nuclear program. The West is convinced that Tehran's real objective is to build an atomic bomb - something which the Jewish state will never accept because its leaders consider a nuclear armed-Iran a threat to its very existence.
Adding to the international pressure, U.S. ambassador to Israel Daniel Shapiro said this week American military plans to strike Iran were "ready" and the option was "fully available".
The central role Iran plays in Netanyahu's deliberations is reflected in the huge map of the Middle East hanging by the door of his office. Israel lies on one edge, with Iran taking pride of place in the centre.
Experts say that within a few months, much of Iran's nuclear program will have been moved deep underground beneath the Fordow mountain, making a successful military strike much more difficult.