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U.S. and USSR/Russia nuclear stockpiles

The nuclear arms race was a competition for supremacy in nuclear warfare between the United Statesmarker, the Soviet Unionmarker, and their respective allies during the Cold War. During the Cold War, in addition to the American and Soviet nuclear stockpiles, other countries also developed nuclear weapons, though none engaged in warhead production on nearly the same scale as the two superpowers.

World War II

The first nuclear weapon was created by the American Manhattan Project during the Second World War and was developed for use against the Axis powers. Scientists in the Soviet Unionmarker, then an ally of the United States, were aware of the possibility of nuclear weapons and had been doing some work in that direction The Soviet Nuclear Weapons Program.

The Soviet Union was not officially informed of the American experiments until Stalin was informed at the Potsdam Conference on July 24,1945. The Americans did not trust the Soviets enough to keep the information from German spies; there was also deep distrust of the Soviets and their intentions, despite the wartime partnership. Even during the war many government and military figures in the USA saw the USSR as a potential enemy in the future.

Despite this, the Soviets were well aware of the program due to a spy ring operating within the American nuclear program. The atomic spies (including Klaus Fuchs and Theodore Hall) kept Stalin well informed of American developments . When U.S. President Harry S. Truman informed Stalin of the weapons, he was surprised at how calmly Stalin took the news and thought that Stalin had not understood what he had told him. In fact Stalin had long been aware of the program. The American program had been so secret that even Truman did not know about the weapons until he became president; Stalin had thus known about the Manhattan Project before Truman himself did.

In August of 1945, atomic bombs were dropped per Truman's order on designated Japanesemarker cities. The first bombmarker was dropped on Hiroshima, and then another bombmarker was dropped on Nagasaki by the B-29 bombers Enola Gay and Bock's Car respectively.

Early Cold War

In the years immediately after the Second World War, the United States had a nuclear monopoly on both specific knowledge and, most importantly, raw materials. Initially, it was thought that uranium was relatively rare in the world, but this was discovered to be incorrect. While American leaders hoped that their exclusivity would be able to draw concessions from the Soviet Union, this proved ineffective.Behind the scenes the Soviet regime was working furiously to build their own atomic weapons. During the war Soviet efforts had been limited by a lack of uranium, but new supplies in Eastern Europe were taken and provided a steady supply while the Soviets developed a domestic source. While American thinkers had predicted that the USSR would not have nuclear weapons until the mid-1950s, the first Soviet bomb was detonated on August 29 of 1949, shocking the entire world. The weapon (called "Joe Onemarker" by the West) was more or less a copy of the weapon which the United States had dropped on Japan ("Fat Manmarker").

Governments devoted massive amounts of resources to increasing the quality and quantity of their nuclear arsenal. Both nations quickly began work on hydrogen bombs and the United Statesmarker detonated the first such device on November 1, 1952. Again the Soviets surprised the Americans by exploding a deployable thermonuclear device of their own the next August, though it was not actually a "true" multi-stage hydrogen bomb (that would wait until 1955). The Soviet H-bomb was almost completely a product of domestic research, as their espionage sources in the USA had only worked on very preliminary (and incorrect) versions of the hydrogen bomb.

The most important development in terms of delivery in the 1950s was the introduction of ICBMs. Missiles had long been seen as the ideal platform for nuclear weapons and in 1957 on the 4th of October with the launch of Sputnik the Soviet Union showed the world that they had missiles that could hit anywhere in the world. The United States launched their own on the 31 October 1959. The Space Race showcased technology that was critical to nuclear weapons delivery (the ICBM boosters) while maintaining the Beginning and ages of science and exploration.

This period also saw attempts begin to defend against nuclear weapons. Both powers built large radar arrays to detect incoming bombers and missiles. Fighters to use against bombers and anti-ballistic missiles to use against ICBMs were also developed. Large underground bunkers were constructed to save the leadership of the superpowers, and individuals were told to build fallout shelters and taught how to react to a nuclear attack (civil defense).These bombs could kill millions in the event of an attack by either side.

Mutually Assured Destruction (MAD)

For a detailed article about Mutually Assured Destruction, see Mutual Assured Destruction

All of these defensive measures were far from foolproof and by the 1950s both the United States and Soviet Union had the power to obliterate the other side. Both sides developed a "second-strike" capability , i.e. they could launch a devastating attack even after sustaining a full assault from the other side (especially by means of submarines). This policy was part of what became known as Mutually Assured Destruction: both sides knew that any attack upon the other would be suicide for themselves as well, and thus would (in theory) refrain from attacking one another.

Both Soviet and American thinkers hoped to use nuclear weapons to extract concessions from the other side, or from other powers such as Chinamarker, but the risk of any use of these weapons was so large that both sides refrained from what John Foster Dulles referred to as brinkmanship. While some like General Douglas MacArthur argued nuclear weapons should be used during the Korean War both Truman and Eisenhower disagreed.

Both sides were also unaware of how their relative arsenals compared. The Americans tended to be lacking in confidence, in the 1950s they believed in a non-existent "bomber gap" (aerial photography later discovered that the Soviets had been playing a sort of Potemkin village game with their bombers in their military parades, flying them in large circles to make it appear they had far more than they truly did), and the 1960 American presidential election saw accusations of a wholly spurious "missile gap" between the Soviets and the Americans. The Soviet government structure tended to exaggerate the power of Soviet weapons to the leadership and Nikita Khrushchev.

An additional controversy formed in the United States during the early-1960s over whether or not it was known if their weapons would work at all if it came down to it. All of the individual components of nuclear missiles had been tested separately (warheads, navigation systems, rockets), but it had been infeasible to test them all as a whole. Critics charged that it was not really known how a warhead would function in the gravity forces and temperature differences encountered in the upper atmosphere and outer space, and Kennedy was unwilling to run a risky test of an ICBM with a live warhead. The closest thing to an actual test, 1962's Operation Frigate Bird, in which the submarine USS Ethan Allen launched a Polaris A1 missile over 1,000 miles to the nuclear test site at Christmas Islandmarker, was challenged by critics (including Curtis LeMay, who used doubt over missile accuracy to encourage the development of new bombers) on the grounds that it was a single test (and could therefore be an anomaly), was a lower-altitude SLBM (and therefore was subject to different conditions than an ICBM), and that significant modifications had been made to its warhead before testing.

Strategic nuclear missiles, warheads and throw-weights of United States and USSR, 1964-82
Year Launchers Warheads Megatonnage
1964 2,416 375 6,800 500 7,500 1,000
1966 2,396 435 5,000 550 5,600 1,200
1968 2,360 1,045 4,500 850 5,100 2,300
1970 2,230 1,680 3,900 1,800 4,300 3,100
1972 2,230 2,090 5,800 2,100 4,100 4,000
1974 2,180 2,380 8,400 2,400 3,800 4,200
1976 2,100 2,390 9,400 3,200 3,700 4,500
1978 2,058 2,350 9,800 5,200 3,800 5,400
1980 2,042 2,490 10,000 6,000 4,000 5,700
1982 2,032 2,490 11,000 8,000 4,100 7,100
Source: Gerards Segal, The Simon & Schuster Guide to the World Today, (Simon & Schuster, 1987), p. 82in: Edwin Bacon, Mark Sandle, "Brezhnev Reconsidered", Studies in Russian and East European History and Society (Palgrave Macmillan, 2003)

Initial nuclear proliferation

In addition to the United States and the Soviet Union, three other nations, the United Kingdommarker, People's Republic of Chinamarker, and Francemarker also developed far smaller nuclear stockpiles. In 1952, the United Kingdom became the third nation to possess nuclear weapons when it detonated an atomic bomb in Operation Hurricanemarker in Australia on October 3, 1952. During the Cold War, British nuclear deterrence came from submarines and nuclear-armed aircraft. The Resolution class ballistic missile submarines armed with the American-built Polaris missile provided the sea deterrent, while aircraft such as the Avro Vulcan, SEPECAT Jaguar, Panavia Tornado and several other Royal Air Force strike aircraft carrying WE.177 gravity bomb provided the air deterrent.

France became the fourth nation to possess nuclear weapons on February 13, 1960, when the atomic bomb Gerboise Bleuemarker was detonated in Algeriamarker, then still a French colony. During the Cold War, the French nuclear deterrent was centered around the Force de frappe, a nuclear triad consisting of Dassault Mirage IV bombers carrying such nuclear weapons as the AN-22 gravity bomb and the ASMP stand-off attack missile, Pluton and Hades ballistic missiles, and the Redoutable class submarine armed with strategic nuclear missiles.

The People's Republic of China became the fifth nuclear power on October 16, 1964, when it detonated a uranium-235 bomb in a test codenamed 596. Due to Soviet/Chinese tensions, the Chinese might have used nuclear weapons against either the United States or the Soviet Union in the event of a nuclear war between the United States and the Soviet Union . During the Cold War, the Chinese nuclear deterrent consisted of gravity bombs carried aboard H-6 bomber aircraft, missile systems such as the DF-2, DF-3, and DF-4, and in the later stages of the Cold War, the Type 092 ballistic missile submarine.


Economic problems caused by the arms race in both powers, combined with China's new role and the ability to verify disarmament led to a number of arms control agreements beginning in the 1970s. This period known as détente allowed both states to reduce their spending on weapons systems. SALT I and SALT II and all limited the size of the states arsenals. Bans on nuclear testing, anti-ballistic missile systems, and weapons in space all attempted to limit the expansion of the arms race through the Partial Test Ban Treaty.

These treaties were only partially successful. Both states continued building massive numbers of nuclear weapons, and new technologies such as multiple independently targetable reentry vehicles (also known as MIRVs) limited the effectiveness of the treaties. Both superpowers retained the ability to destroy each other many times over.

Reagan and the Strategic Defense Initiative

Towards the end of Jimmy Carter's presidency, and continued strongly through the subsequent presidency of Ronald Reagan, the United States rejected disarmament and tried to restart the arms race through the production of new weapons and anti-weapons systems. The central part of this strategy was the Strategic Defense Initiative, a space based anti-ballistic missile system derided as "Star Wars" by its critics. During the second part of 1980s, the Soviet economy was teetering towards collapse and was unable to match American arms spending. Numerous negotiations by Mikhail Gorbachev attempted to come to agreements on reducing nuclear stockpiles, but the most radical were rejected by Reagan as they would also prohibit his SDI program.

Post-Cold War

With the end of the Cold War the United States, and especially Russia, cut down on nuclear weapons spending. Fewer new systems were developed and both arsenals have shrunk. But both countries still maintain stocks of nuclear missiles numbering in the thousands. In the USA, stockpile stewardship programs have taken over the role of maintaining the aging arsenal.

After the Cold War ended, a large amount of resources and money which was once spent on developing nuclear weapons in USSR was then spent on repairing the environmental damage produced by the nuclear arms race, and almost all former production sites are now major cleanup sites. In the USA, the plutonium production facility at Hanford, Washingtonmarker and the plutonium pit fabrication facility at Rocky Flats, Coloradomarker are among the most polluted sites.

United States policy and strategy regarding nuclear proliferation was outlined in 1995 in the document "Essentials of Post-Cold War Deterrence".

Despite efforts made in cleaning up uranium sites, significant problems stemming from the legacy of uranium development still exist today on the Navajo Nation in the states of Utahmarker, Coloradomarker, New Mexicomarker, and Arizonamarker. Hundreds of abandoned mines have not been cleaned up and present environmental and health risks in many Navajo communities.

India and Pakistan

The South-Asian states of Indiamarker and Pakistanmarker have also engaged in a nuclear arms race. India detonated what it called a "peaceful nuclear device" in 1974 ("Smiling Buddha") much to the surprise and alarm of the world who had been giving India nuclear technology for civilian, energy producing and peaceful purposes. The test generated great concern in Pakistan, which feared that it would be at the mercy of its long-time arch rival and quickly responded by pursuing its own nuclear weapons program. In the last few decades of the 20th century, Pakistan and India began to develop nuclear-capable rockets, and Pakistan had its own covert bomb program with Chinese proliferation which extended over many years since the first Indian weapon was detonated. In 1998 India, under Atal Bihari Vajpayee government, test detonated 5 more nuclear weapons. While the international response to the detonation was muted , domestic pressure within Pakistan began to build steam and Prime Minister Mian Muhammad Nawaz Sharif ordered the test, detonated 6 nuclear war weapons in a tit-for-tat fashion and to act as a deterrent.


Israelmarker is widely believed to possess a substantial arsenal of nuclear weapons and maintains intermediate-range ballistic missiles to deliver them. The Israeli government refuses to officially confirm or deny that it has a nuclear weapon program, and has an unofficial but rigidly enforced policy of deliberate ambiguity, saying only that it would not be the first to "introduce nuclear weapons in the Middle East". Israel is widely believed to be one of the nuclear-armed nation-states not within the Nuclear Non-Proliferation Treaty (NPT), the other three being India, Pakistan and North Koreamarker.In a December 2006 interview, Israeli Prime Minister Ehud Olmert said Iranmarker aspires "to have a nuclear weapon as America, France, Israel and Russia." Olmert's office later said that the quote was taken out of context, in other parts of the interview, Olmert refused to confirm or deny Israel's nuclear weapon status. According to The Nuclear Threat Initiative, based on Vanunu's information, Israel had approximately 200 nuclear explosive devices by 1980 and a Jericho missile delivery system .

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