Nuclear latency or a nuclear threshold state is the condition of a country possessing all the technology, expertise and infrastructure needed to quickly develop nuclear weapons, without having actually yet done so. [1] Japan is considered a "paranuclear" state, with complete technical prowess to develop a nuclear weapon quickly, [2] [3] and is sometimes called being "one screwdriver's turn" from the bomb, as it is considered to have the materials and technical capacity to make a nuclear weapon at will. [4] [5] [6] [7] [8] [9]
Alongside Japan, Iran is also considered a nuclear threshold state, [10] [11] [12] [13] and has been described being "a hop, skip, and a jump away" from developing nuclear weapons, [14] [15] [16] with its advanced nuclear program capable of producing fissile material for a bomb in a matter of days if weaponized. [17] [18] [19] Other notable nuclear threshold states are Canada, Germany, the Netherlands, and Brazil. [20] [21] [22]
Nuclear latency can be achieved with solely peaceful intentions, but in some cases nuclear latency is achieved in order to be able to create nuclear arms in the future, which is known as "nuclear hedging". [23] While states engaging in nuclear hedging do not directly violate the NPT, they do run the risk of potentially encouraging their neighboring states, particularly those they have had conflicts with, to do the same, spawning a "virtual" arms race to ensure the potential of future nuclear capability. [23] Such a situation could rapidly escalate into an actual arms race, drastically raising tensions in the region and increasing the risk of a potential nuclear exchange. [23]
In a paper written following the establishment of the JCPOA, a Counselor of the Nuclear Threat Initiative, John Carlson, outlined several criteria for use in helping to determine whether a state's nuclear program was run solely with peaceful intentions, or if the state was engaging in nuclear hedging: [23]
South Africa has successfully developed its own nuclear weapons, but dismantled them in 1989. Taiwan and South Korea have both been identified as "insecure" nuclear threshold states—states with the technical capability to develop nuclear weapons. South Korea had been involved in nuclear energy technology since the end of the Korean War, and possessed an active nuclear weapons program that was terminated in the mid-1970s with its signing of the Nuclear Non-Proliferation Treaty, while still engaging in some clandestine nuclear weapons research into the late 1980s, and the security motivations to seriously contemplate such an option—since the publishing of a Mitre Corporation report in 1977. [24] [25] [26] US intelligence also believes Taiwan has designed devices suitable for nuclear testing. [27]
The number of states that are technically nuclear-latent has steadily increased as nuclear energy and its requisite technologies have become more available, but the number of states that are actually at the threshold status are limited. [28] [29] Nuclear latency does not presume any particular intentions on the part of a state recognized as being nuclear-latent. [29]
A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion reactions, producing a nuclear explosion. Both bomb types release large quantities of energy from relatively small amounts of matter.
The Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Non-Proliferation Treaty or NPT, is an international treaty whose objective is to prevent the spread of nuclear weapons and weapons technology, to promote cooperation in the peaceful uses of nuclear energy, and to further the goal of achieving nuclear disarmament and general and complete disarmament. Between 1965 and 1968, the treaty was negotiated by the Eighteen Nation Committee on Disarmament, a United Nations-sponsored organization based in Geneva, Switzerland.
Nuclear proliferation is the spread of nuclear weapons, fissionable material, and weapons-applicable nuclear technology and information to nations not recognized as "Nuclear Weapon States" by the Treaty on the Non-Proliferation of Nuclear Weapons, commonly known as the Non-Proliferation Treaty or NPT. Proliferation has been opposed by many nations with and without nuclear weapons, as governments fear that more countries with nuclear weapons will increase the possibility of nuclear warfare, de-stabilize international or regional relations, or infringe upon the national sovereignty of nation states.
Nuclear disarmament is the act of reducing or eliminating nuclear weapons. Its end state can also be a nuclear-weapons-free world, in which nuclear weapons are completely eliminated. The term denuclearization is also used to describe the process leading to complete nuclear disarmament.
Nuclear warfare, also known as atomic warfare, is a military conflict or prepared political strategy that deploys nuclear weaponry. Nuclear weapons are weapons of mass destruction; in contrast to conventional warfare, nuclear warfare can produce destruction in a much shorter time and can have a long-lasting radiological result. A major nuclear exchange would likely have long-term effects, primarily from the fallout released, and could also lead to secondary effects, such as "nuclear winter", nuclear famine, and societal collapse. A global thermonuclear war with Cold War-era stockpiles, or even with the current smaller stockpiles, may lead to various scenarios including human extinction.
North Korea has a military nuclear weapons program and, as of 2024, is estimated to have an arsenal of approximately 50 nuclear weapons and sufficient production of fissile material for six to seven nuclear weapons per year. North Korea has also stockpiled a significant quantity of chemical and biological weapons. In 2003, North Korea withdrew from the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). Since 2006, the country has conducted six nuclear tests at increasing levels of expertise, prompting the imposition of sanctions.
Abdul Qadeer Khan,, known as A. Q. Khan, was a Pakistani nuclear physicist and metallurgical engineer who is colloquially known as the "father of Pakistan's atomic weapons program".
The People's Republic of China has developed and possesses weapons of mass destruction, including chemical and nuclear weapons. The first of China's nuclear weapons tests took place in 1964, and its first hydrogen bomb test occurred in 1966 at Lop Nur. Tests continued until 1996, when the country signed the Comprehensive Nuclear-Test-Ban Treaty (CTBT), but did not ratify it. China acceded to the Biological Weapons Convention (BWC) in 1984 and ratified the Chemical Weapons Convention (CWC) in 1997. Since 2020, China has been wielding a nuclear triad, alongside four other countries.
Israel is believed to possess weapons of mass destruction, and to be one of four nuclear-armed countries not recognized as a Nuclear Weapons State by the Non-Proliferation Treaty (NPT). The US Congress Office of Technology Assessment has recorded Israel as a country generally reported as having undeclared chemical warfare capabilities, and an offensive biological warfare program. Officially, Israel neither confirms nor denies possessing nuclear weapons.
Taiwan pursued a number of weapons of mass destruction programs from 1949 to the late 1980s. The final secret nuclear weapons program was shut down in the late 1980s under US pressure after completing all stages of weapons development besides final assembly and testing. Taiwan lacked an effective delivery mechanism and would have needed to further miniaturize any weapon for effective use in combat. Currently, there is no evidence of Taiwan possessing any chemical, biological, or nuclear weapons. However, nuclear weapons from the United States were deployed to Taiwan during a period of heightened regional tensions with China beginning with the First Taiwan Strait Crisis and ending in the 1970s.
During World War II, Japan had several programs exploring the use of nuclear fission for military technology, including nuclear reactors and nuclear weapons. Like the similar wartime programs in Nazi Germany, it was relatively small, suffered from an array of problems brought on by lack of resources and wartime disarray, and was ultimately unable to progress beyond the laboratory stage during the war.
South Korea has the raw materials and equipment to produce a nuclear weapon. However, it has not opted to make one. South Korea has continued on a stated policy of non-proliferation of nuclear weapons since 2004 and has adopted a policy to maintain a nuclear-free Korean Peninsula. South Korea also allows the United States to maintain nuclear weapons on its territories, which the US first brought to the peninsula in January 1958. North Korea has and is developing additional nuclear weapons.
Iran is not known to currently possess weapons of mass destruction (WMD) and has signed treaties repudiating the possession of WMD including the Biological Weapons Convention, the Chemical Weapons Convention, and the Non-Proliferation Treaty (NPT). Iran has first-hand knowledge of WMD effects—over 100,000 Iranian troops and civilians were victims of chemical weapons during the 1980s Iran–Iraq War.
The nuclear weapons debate refers to the controversies surrounding the threat, use and stockpiling of nuclear weapons. Even before the first nuclear weapons had been developed, scientists involved with the Manhattan Project were divided over the use of the weapon. The only time nuclear weapons have been used in warfare was during the final stages of World War II when USAAF B-29 Superfortress bombers dropped atomic bombs on the Japanese cities of Hiroshima and Nagasaki in early August 1945. The role of the bombings in Japan's surrender and the U.S.'s ethical justification for them have been the subject of scholarly and popular debate for decades.
The United States was the first country to manufacture nuclear weapons and is the only country to have used them in combat, with the bombings of Hiroshima and Nagasaki in World War II against Japan. Before and during the Cold War, it conducted 1,054 nuclear tests, and tested many long-range nuclear weapons delivery systems.
Project 596 was the first nuclear weapons test conducted by the People's Republic of China, detonated on 16 October 1964, at the Lop Nur test site. It was a uranium-235 implosion fission device made from weapons-grade uranium (U-235) enriched in a gaseous diffusion plant in Lanzhou.
Operation Opera, also known as Operation Babylon, was a surprise airstrike conducted by the Israeli Air Force on 7 June 1981, which destroyed an unfinished Iraqi nuclear reactor located 17 kilometres southeast of Baghdad, Iraq. The Israeli operation came a year after the Islamic Republic of Iran Air Force had caused minor damage to the same nuclear facility in Operation Scorch Sword, with the damage having been subsequently repaired by French technicians. Operation Opera, and related Israeli government statements following it, established the Begin Doctrine, which explicitly stated the strike was not an anomaly, but instead "a precedent for every future government in Israel". Israel's counter-proliferation preventive strike added another dimension to its existing policy of deliberate ambiguity, as it related to the nuclear weapons capability of other states in the region.
Libya pursued programs to develop or acquire weapons of mass destruction from when Muammar Gaddafi seized control of Libya in 1969 until he announced on 19 December 2003 that Libya would voluntarily eliminate all materials, equipment and programs that could lead to internationally proscribed weapons. This included weapons of mass destruction and long-range ballistic missiles.
Views on the nuclear program of Iran vary greatly, as the nuclear program of Iran is a very contentious geopolitical issue. Uriel Abulof identifies five possible rationales behind Iran’s nuclear policy: (i) Economy, mainly energy needs; (ii) Identity politics, pride and prestige; (iii) Deterrence of foreign intervention; (iv) Compellence to boost regional influence; and (v) Domestic politics, mitigating, through 'nuclear diversion' the regime’s domestic crisis of legitimacy. Below are considerations of the Iranian nuclear program from various perspectives.
For more on the proliferation and debates surrounding nuclear weapons and their latency, visit the Woodrow Wilson Center's Nuclear Proliferation International History Project website: http://wilsoncenter.org/program/nuclear-proliferation-international-history-project.