Nuclear triad
Israel is known to have nuclear-capable aircraft and land-base missiles, with the addition of nuclear-armed submarines this would mean that they now have a full triad of land-, air-, and sea-based nuclear delivery systems some of which would be invulnerable to a first strike by an enemy for the first time in their country's history. No other nation in the Middle East in known to be in possession of nuclear weapons, even though Iran, Iraq, Syria and Libya have started development programs that were never completed.
United Nations Security Council Resolution 1747
Iran and weapons of mass destruction:
As of 2007, Iran is not known to possess weapons of mass destruction and has signed treaties repudiating their possessions, including the Biological Weapons Convention, the Chemical Weapons Convention, and the Nuclear Non-Proliferation Treaty (NPT). A number of countries, including the United States, the United Kingdom, and France, have accused Iran of a clandestine intention to develop nuclear weapons. By most estimates, Iran is at least two to six years away from being able to produce an atomic bomb, even if it wanted to.