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 and the United Kingdom
The United Kingdom is one of the five nuclear-weapon states legally recognised as such under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). , nine countries have nuclear weapons. After the UK government announced its plans to refurbish its Trident missiles and build new submarines to carry them, it published a white paper on "The Future of the United Kingdom's Nuclear Deterrent", in which it stated that the renewal is fully compatible with the United Kingdom's treaty commitments and international law. At the start of the House of Commons debate to authorise the replacement of Trident, Margaret Beckett, the Secretary of State for Foreign and Commonwealth Affairs, stated: