The "nuclear umbrella" is a guarantee by a nuclear weapons state to defend a non-nuclear allied state. The context is usually the security alliances of the United States with Australia, [1] Japan, [2] South Korea, [3] the North Atlantic Treaty Organization (much of Europe, Turkey and Canada) and the Compact of Free Association (the Federated States of Micronesia, the Marshall Islands, and Palau). Those alliances were formed because of the Cold War and the Soviet Union. For some countries, it was an alternative to acquiring nuclear weapons themselves; other alternatives include regional nuclear-weapon-free zones or nuclear sharing.
NATO was formed early in the Cold War and, from the beginning, assumed American nuclear power as a major component of defense of Western Europe from possible Soviet invasion. Most non-Communist European states joined the alliance, although some (Ireland, Switzerland, Austria, Sweden, Finland) instead maintained an official policy of neutrality. Sweden and Switzerland considered developing their own nuclear weapons but abandoned the idea.
NATO involved others of the five official nuclear weapons states. The United Kingdom and Canada participated in the initial American development of the atomic bomb (Manhattan Project) during World War II, but were afterwards excluded from nuclear weapons secrets by act of the US Congress. Britain launched an independent nuclear weapons program; after Britain successfully developed thermonuclear weapons, the US and UK signed the 1958 US–UK Mutual Defence Agreement sharing American weapons designs, eliminating the need for independent development. Canada has not officially maintained and possessed weapons of mass destruction since 1984 (Canada and weapons of mass destruction)
France developed a nuclear force de frappe and left the NATO command structure while continuing to be allied with the other Western countries. NATO nuclear sharing was conceived to prevent further independent proliferation among the western allies. France later rejoined the NATO joint military command on April 4, 2009.
After the end of the Cold War, many Central and Eastern European countries joined NATO.
The United States has promised its role as a "nuclear umbrella" for numerous non-nuclear allied states, even as early as the Cold War. [1] The US now has security alliances of this nature with around 30 countries, many within NATO itself. [4] The country also has notable arrangements of this type with South Korea [3] and Australia. [1] The US understood the power of deterrence with nuclear weapons early on, beginning with the concept of massive retaliation during the Eisenhower administration. [5] As the USSR and other countries became nuclear powers as well, however, the risk of any nuclear exchange became more clear. [5] This, in part, motivated the US to adopt the new strategy of deterrence, in which they would have more control over the situation, while still maintaining the ability to intervene in conflicts, a nuclear umbrella. [5] The US provides protection and deterrence for various countries under its umbrella, and in turn, the countries do not pursue nuclear weapons programs themselves. [4] More recently, however, concerns have been raised about the diminishing power of such a threat, due to the rapid increase of nuclear weapons of mass destruction across the globe. [4] Russia in particular has caused concern, having focused their military doctrine on nuclear weapons, as well as continued in the development of their weapons programs. [4] Currently, the United States holds only some "nonstrategic" military weapons in Europe, and these nonstrategic weapons aid in reassuring countries under the umbrella, and emphasizing their role as a deterrent. [4] The strategy of deterrence remains unequivocally important for the country, but many argue that the US will face various new challenges when it comes to the rise of other nuclear powers and weapons of mass destruction. [4]
ANZUS is a security treaty between Australia, New Zealand, and the United States that was signed on September 1, 1951. [6] This treaty was meant to assure peace in the South Pacific region. It was primarily a tactic against communist spread assuring Australia and New Zealand they would not be caught under communist grip. New Zealand, Australia, and the United States agreed to maintain and develop military resources to prevent an attack from communist countries in the Pacific. [7] As late as 1970, Australia considered embarking on nuclear weapons development [8] but finally agreed to sign the Nuclear Non-Proliferation Treaty. Since then Australia has been a proponent of nuclear disarmament. New Zealand declared themselves as a nuclear free zone in 1984 which refused to allow US nuclear powered ships to dock in New Zealand. Thus, in 1986 the United States suspended its treaty with New Zealand, but kept it with Australia. [9] Today, leaders in the Australian government publicly acknowledge the country's reliance on the US nuclear umbrella. [10] Australia no longer faces immediate nuclear threats, but they do still rely on the US for protection in any future instances, making them one of 31 countries under the US nuclear umbrella. [1]
The Japanese nuclear weapon program was conducted during World War II. Like the German nuclear weapons program, it suffered from an array of problems, and was ultimately unable to progress beyond the laboratory stage. Following the atomic bombings of Hiroshima and Nagasaki, World War II and the deconstruction of the imperial military, Japan came under the US "nuclear umbrella" on the condition that it will not produce nuclear weapons. This was formalized in the Security Treaty Between the United States and Japan, which preceded the current security alliance, the Treaty of Mutual Cooperation and Security between the United States and Japan.
Japan and the United States also have a major missile defense accord to mitigate the North Korean nuclear threat, among others [11] and have deployed the Aegis Ballistic Missile Defense System jointly.
Following the Korean War, South Korea was welcomed under the US "nuclear umbrella" after signing the ROK-US mutual security treaty on October 1, 1953. [12] This was characteristic of US defense and foreign policy at the time, which championed extended deterrence in an effort to prevent any nuclear conflict. [12] The agreement also aligned with the US nonproliferation objectives, by eliminating the need for South Korea to develop its own nuclear weapons program. [13] In the ROK-US mutual security treaty, the US agreed to deter attacks against South Korea and defend them in the case of attacks, and to deploy troops at the Korean Demilitarized Zone. [14] The US also positioned tactical nuclear weapons on the Korean Peninsula, but these weapons were retracted by President Bush in September 1991. [12] The US nuclear umbrella over South Korea has persisted for almost 70 years. Most agree on the necessity and significance of the US nuclear umbrella and the ROK-US treaty for South Korea, and expect it to hold its place. [13] [14]
Like NATO, the members of the Warsaw Pact were protected by nuclear weapons of the Soviet Union with the weapons being deployed either in Soviet territory or closer to NATO in territory of the other member states, particularly Poland (see Poland and weapons of mass destruction). Unlike NATO however there was no nuclear sharing and all weapons remained completely under Soviet control. At least one member of the Warsaw Pact, Romania, did consider developing its own arsenal but later abandoned it (see Romania and weapons of mass destruction). Most Eastern European Communist states were part of the Warsaw Pact with the exception of Yugoslavia which became neutral especially after the Tito–Stalin Split, and Albania later left the alliance after the Soviet–Albanian split and aligned itself with the People's Republic of China which had also cut ties with the Soviets in the Sino-Soviet split.
It is unclear if and to what extent the Soviet Union's nuclear umbrella covered other allied communist and non communist states outside of the Warsaw Pact at one time or another besides China prior to the Sino-Soviet Split (see China and weapons of mass destruction) and Cuba (see the Cuban Missile Crisis).
The term is far less used for Russian nuclear guarantees, but is seen occasionally.
The 1994 Budapest Memorandum includes:
The Russian Federation, the United Kingdom of Great Britain and Northern Ireland, and The United States of America reaffirm their commitment to seek immediate United Nations Security Council action to provide assistance to Ukraine, as a non-nuclear-weapon state party to the Treaty on the Non-Proliferation of Nuclear Weapons, if Ukraine should become a victim of an act of aggression or an object of a threat of aggression in which nuclear weapons are used.
In a unilateral governmental statement in 1994, China provided Ukraine with nuclear security guarantee, where China states its inclination to peaceful settlement of differences and disputes by way of fair consultations. [15] In December 2013, Ukrainian President Viktor Yanukovych and Chinese Communist Party leader Xi Jinping signed a bilateral treaty and published a joint statement, where China reaffirmed that it will provide Ukraine with nuclear security guarantees upon nuclear invasion or threats of invasion. [16] [17] People's Daily , the official newspaper of the Central Committee of the Chinese Communist Party, used the headline "China offers Ukraine nuclear umbrella protection", which has been censored since the Russian invasion of Ukraine. [17] When asked about the 2013 pact during a news conference on 3 March 2022, Wang Wenbin, a spokesperson for China's Foreign Ministry, sidestepped the question by referring to a United Nations resolution on the security of nonnuclear states like Ukraine. “The security assurances have clear limitations on the content and are triggered under specific conditions,” Mr. Wang said. [18]
Missile defense would provide an "umbrella" of another kind against nuclear attack. This is not the conventional usage of "nuclear umbrella", but a rhetorical device promoting active defense over the nuclear deterrence the conventional "nuclear umbrella" depends upon. [19] NATO had an expansive strategy with respect to missile defense. In 1999, it was concluded that they would need some form of defense against nuclear, biological, or chemical threats. [20] One form of strategy was declared at the 2002 Prague Summit, the NATO Active Layered Ballistic Missile Defense (ALTBMD). This was an extension to the deployed forces program in 2005, namely, guaranteeing their safety. One of the leading motivations for the strategic concept is that NATO centered on the proliferation of nuclear weapons and alternatives for weapons of mass destruction as being an incalculable threat to global life and prosperity. More recent, on March 6, 2013, the first European theater missile interceptor system proved successful to work in conjunction with NATO's Interim Ballistic Missile Defense (BMD) command and control system, such that it successfully engaged and destroyed a theater ballistic missile target set at the French Firing Range in Biscarrosse. Countries involved with NATO host various components of the NATO missile defense command and control systems. The United States contribution to the NATO BMD is through its European Phased Adaptive Approach (EPAA). [21] Turkey hosts the United States BMD radar in Kürecik. Romania hosts a United States Aegis Ashore Site at Deveselu Military Base. Germany hosts the command center Ramstein Air Base. In addition to the EPAA, Spain holds four multi-mission BMD-capable Aegis Ships at the Rota Naval Base. With respect to all these constituents, they are in fact all voluntarily hosted. Outside of this there is additional composition of force protection and BMD capable-assets, that in the event of needed support could be engaged. With the stakes of nuclear war implausibly comprehensive advocacy groups such as the Missile Defense Advocacy Alliance (MDAA) were formed as a public initiative to cultivate an environment for the critical importance of supporting the funding and development of missile defense systems. [22] The MDAA is a non-profit organization that has set out a mission to educate the general public on advocacy for the testing, continued development, and deployment of missile defense systems and the urgent consequences of handicapping a missile defense system.
The Anti-Ballistic Missile Treaty, also known as the ABM Treaty or ABMT, was an arms control treaty between the United States and the Soviet Union on the limitation of the anti-ballistic missile (ABM) systems used in defending areas against ballistic missile-delivered nuclear weapons. It was intended to reduce pressures to build more nuclear weapons to maintain deterrence. Under the terms of the treaty, each party was limited to two ABM complexes, each of which was to be limited to 100 anti-ballistic missiles.
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.
Mutual assured destruction (MAD) is a doctrine of military strategy and national security policy which posits that a full-scale use of nuclear weapons by an attacker on a nuclear-armed defender with second-strike capabilities would result in the complete annihilation of both the attacker and the defender. It is based on the theory of rational deterrence, which holds that the threat of using strong weapons against the enemy prevents the enemy's use of those same weapons. The strategy is a form of Nash equilibrium in which, once armed, neither side has any incentive to initiate a conflict or to disarm.
In nuclear ethics and deterrence theory, no first use (NFU) refers to a type of pledge or policy wherein a nuclear power formally refrains from the use of nuclear weapons or other weapons of mass destruction (WMD) in warfare, except for as a second strike in retaliation to an attack by an enemy power using WMD. Such a pledge would allow for a unique state of affairs in which a given nuclear power can be engaged in a conflict of conventional weaponry while it formally forswears any of the strategic advantages of nuclear weapons, provided the enemy power does not possess or utilize any such weapons of their own. The concept is primarily invoked in reference to nuclear mutually assured destruction but has also been applied to chemical and biological warfare, as is the case of the official WMD policy of India.
World War III, also known as the Third World War, is a hypothetical future global conflict subsequent to World War I (1914–1918) and World War II (1939–1945). It is widely assumed that such a war would involve all of the great powers, like its predecessors, as well as the use of nuclear weapons or other weapons of mass destruction, surpassing all prior conflicts in geographic scope, devastation and loss of life.
National missile defense (NMD) refers to the nationwide antimissile program the United States has had under development since the 1990s. After the renaming in 2002, the term now refers to the entire program, not just the ground-based interceptors and associated facilities.
The Intermediate-Range Nuclear Forces Treaty was an arms control treaty between the United States and the Soviet Union. US President Ronald Reagan and Soviet General Secretary Mikhail Gorbachev signed the treaty on 8 December 1987. The US Senate approved the treaty on 27 May 1988, and Reagan and Gorbachev ratified it on 1 June 1988.
The nuclear arms race was an arms race competition for supremacy in nuclear warfare between the United States, the Soviet Union, and their respective allies during the Cold War. During this same period, in addition to the American and Soviet nuclear stockpiles, other countries developed nuclear weapons, though no other country engaged in warhead production on nearly the same scale as the two superpowers.
Harold Brown was an American nuclear physicist who served as United States Secretary of Defense from 1977 to 1981, under President Jimmy Carter. Previously, in the John F. Kennedy and Lyndon B. Johnson administrations, he held the posts of Director of Defense Research and Engineering (1961–1965) and United States Secretary of the Air Force (1965–1969).
The Russian Federation is known to possess or have possessed three types of weapons of mass destruction: nuclear weapons, biological weapons, and chemical weapons. It is one of the five nuclear-weapon states recognized under the Treaty on the Non-Proliferation of Nuclear Weapons.
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.
Missile defense is a system, weapon, or technology involved in the detection, tracking, interception, and also the destruction of attacking missiles. Conceived as a defense against nuclear-armed intercontinental ballistic missiles (ICBMs), its application has broadened to include shorter-ranged non-nuclear tactical and theater missiles.
Flexible response was a defense strategy implemented by John F. Kennedy in 1961 to address the Kennedy administration's skepticism of Dwight Eisenhower's New Look and its policy of massive retaliation. Flexible response calls for mutual deterrence at strategic, tactical, and conventional levels, giving the United States the capability to respond to aggression across the spectrum of war, not limited only to nuclear arms.
A nuclear triad is a three-pronged military force structure of land-based intercontinental ballistic missiles (ICBMs), submarine-launched ballistic missiles (SLBMs), and strategic bombers with nuclear bombs and missiles. Countries build nuclear triads to eliminate an enemy's ability to destroy a nation's nuclear forces in a first-strike attack, which preserves their own ability to launch a second strike and therefore increases their nuclear deterrence.
This timeline of nuclear weapons development is a chronological catalog of the evolution of nuclear weapons rooting from the development of the science surrounding nuclear fission and nuclear fusion. In addition to the scientific advancements, this timeline also includes several political events relating to the development of nuclear weapons. The availability of intelligence on recent advancements in nuclear weapons of several major countries is limited because of the classification of technical knowledge of nuclear weapons development.
The following outline is provided as an overview of and topical guide to the Cold War:
Missile defense systems are a type of missile defense intended to shield a country against incoming missiles, such as intercontinental ballistic missiles (ICBMs) or other ballistic missiles. The United States, Russia, India, France, Israel, Italy, United Kingdom, China and Iran have all developed missile defense systems.
The post–Cold War era is a period of history that follows the end of the Cold War, which represents history after the dissolution of the Soviet Union in December 1991. This period saw many former Soviet republics become sovereign nations, as well as the introduction of market economies in eastern Europe. This period also marked the United States becoming the world's sole superpower.
Nuclear escalation is the concept of a conflict escalating from conventional warfare to nuclear warfare.
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