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.
Nuclear weapons convention
Each year since 1996, the UN General Assembly has passed a resolution calling on all countries immediately to fulfill their disarmament obligation, as articulated by the International Court of Justice, "by commencing multilateral negotiations leading to an early conclusion of a nuclear weapons convention." In 2007, 127 countries voted in favour of the resolution, including four countries with nuclear weapons: China, India, Pakistan and North Korea.