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A high-alert nuclear weapon commonly refers to a launch-ready ballistic missile that is armed with a nuclear warhead whose launch can be ordered (through
High-alert_nuclear_weapon
are maintained for high operational alerts. The following is a list of states that have acknowledged the possession of nuclear weapons or are presumed to
List of states with nuclear weapons
List_of_states_with_nuclear_weapons
of nuclear weapons is the world's third-largest, estimated at 620 nuclear warheads as of 2026[update]. China was the fifth country to develop nuclear weapons
Nuclear_weapons_of_China
to possess nuclear weapons. Estimates of Israel's stockpile range from 90 to 400 warheads, and the country is believed to possess a nuclear triad of delivery
Nuclear_weapons_of_Israel
US Nuclear bomb
Cold War. It is a low-to-intermediate yield strategic and tactical nuclear weapon featuring a two-stage radiation implosion design. The B61 is of the
B61_nuclear_bomb
Crash of US Air Force bomber with nuclear warheads
safeguards meant to prevent that from occurring. One of its nuclear bombs was judged by nuclear weapons engineers at the time to have been only one safety switch
1961_Goldsboro_B-52_crash
South Africa pursued research into weapons of mass destruction, including nuclear, biological, and chemical weapons under the apartheid government. South
South Africa and weapons of mass destruction
South_Africa_and_weapons_of_mass_destruction
Federation possesses the world's largest arsenal of nuclear weapons, consisting of 5,420 nuclear warheads, of which 1,794 have been deployed. It also
Russia and weapons of mass destruction
Russia_and_weapons_of_mass_destruction
possess nuclear weapons. Pakistan is not party to the Nuclear Non-Proliferation Treaty. Pakistan's arsenal is estimated at 170 nuclear weapons as of 2025
Pakistan and weapons of mass destruction
Pakistan_and_weapons_of_mass_destruction
North Korea has the world's smallest stockpile of nuclear weapons, with an estimated 60 warheads and production of fissile material for six to seven warheads
North Korea and weapons of mass destruction
North_Korea_and_weapons_of_mass_destruction
1991, the world's largest stockpiles of nuclear, biological, and chemical weapons. It carried out its first nuclear test in 1949 and its first multi-stage
Soviet Union and weapons of mass destruction
Soviet_Union_and_weapons_of_mass_destruction
test nuclear weapons. The UK is one of nine nuclear-armed states, and one of five recognized by the Treaty on the Non-Proliferation of Nuclear Weapons. As
Nuclear weapons of the United Kingdom
Nuclear_weapons_of_the_United_Kingdom
Energy released in nuclear weapons explosions
yield of a nuclear weapon is the amount of energy released such as blast, thermal, and nuclear radiation, when that particular nuclear weapon is detonated
Nuclear_weapon_yield
List of incidents which could have led to a nuclear exchange
Israel's 1973 nuclear alert". UPI. Archived from the original on 22 June 2020. Retrieved 19 June 2020. "Did Israel ever consider using nuclear weapons?". Haaretz
Nuclear_close_calls
Weapon that can kill many people or cause great damage
A weapon of mass destruction (WMD) is a biological, chemical, radiological, nuclear, or any other weapon that can kill or significantly harm many people
Weapon_of_mass_destruction
American nuclear recoilless gun
Crockett Weapon System was a tactical nuclear recoilless smoothbore gun for firing the M388 nuclear projectile, armed with the W54 nuclear warhead, that
Davy Crockett (nuclear device)
Davy_Crockett_(nuclear_device)
Military conflict that deploys nuclear weaponry
Nuclear warfare, also known as atomic warfare, is a military conflict or prepared political strategy that deploys nuclear weaponry. Nuclear weapons are
Nuclear_warfare
Hypothetical climatic effect of nuclear war
Columbia wildfires. Studies suggest that a full-scale nuclear war, expending thousands of weapons in the largest arsenals in Russia and the United States
Nuclear_winter
Ballistic missile with a range of more than 5,500 kilometres
Emergency Action Message High-alert nuclear weapon ICBM address List of states with nuclear weapons Nuclear disarmament Nuclear navy Nuclear warfare Submarine
Intercontinental ballistic missile
Intercontinental_ballistic_missile
Non-Proliferation Treaty, Biological Weapons Convention, Chemical Weapons Convention, and Comprehensive Nuclear-Test-Ban Treaty. The nuclear program of Iran has been
Iran and weapons of mass destruction
Iran_and_weapons_of_mass_destruction
has possessed nuclear weapons since 1964. It was the last to develop them of the five nuclear-weapon states recognized by the Nuclear Non-Proliferation
China and weapons of mass destruction
China_and_weapons_of_mass_destruction
False alarm sent over all communications media in the U.S. state of Hawaii
alert was widely interpreted as a nuclear attack launched from North Korea. In a subsequent survey, 28% of respondents initially believed the alert,
2018 Hawaii false missile alert
2018_Hawaii_false_missile_alert
Movement opposing nuclear energy and weapons due to environmental and safety concerns
all nuclear weapons, 64 per cent support removing all nuclear weapons from high alert, and 59 per cent support reducing U.S. and Russian nuclear stockpiles
Anti-nuclear_movement
Potential result of major nuclear war
colonialism by anti-nuclear activists. As of 2021, humanity has about 13,410 nuclear weapons, thousands of which are on hair-trigger alert. While stockpiles
Nuclear_holocaust
the ratification of Chemical Weapons Convention (1996) and Nuclear Non-Proliferation Treaty (1998). Over the issue of nuclear energy, Saudi Arabia has made
Saudi Arabia and weapons of mass destruction
Saudi_Arabia_and_weapons_of_mass_destruction
Return of nuclear weapons risk in global security
100 warheads are kept on high operational alert, ready to be fired within minutes. All major nuclear powers are upgrading weapons and delivery systems. For
Nuclear_weapons_resurgence
Nuclear weapon that can be transported in a suitcase
suitcase nuclear device (also suitcase nuke, suitcase bomb, backpack nuke, snuke, mini-nuke, and pocket nuke) is a tactical nuclear weapon that is portable
Suitcase_nuclear_device
This timeline of nuclear weapons development is a chronological catalog of the evolution of nuclear weapons rooting from the development of the science
Timeline of nuclear weapons development
Timeline_of_nuclear_weapons_development
Risk of nuclear conflict during the Russo-Ukrainian war
statements widely seen as nuclear blackmail. The possibility of Russia using tactical nuclear weapons, and the risk of broader nuclear escalation, has been
Nuclear risk during the Russo-Ukrainian war (2022–present)
Nuclear_risk_during_the_Russo-Ukrainian_war_(2022–present)
air transports. Defence Nuclear Materials are moved using the following transport means: Trident nuclear weapons, special nuclear material (SNM) and new
Defence Nuclear Material Transport Operations
Defence_Nuclear_Material_Transport_Operations
Effect of a nuclear explosion on electronic equipment
an electromagnetic pulse is produced by a nuclear explosion was known in the earliest days of nuclear weapons testing. The magnitude of the EMP and the
Nuclear_electromagnetic_pulse
2024 book by Annie Jacobsen
United States stockpile of nuclear warheads went down from an all-time high of 31,255 in 1967 to about 5,000 nuclear weapons in 2024, with 1,770 ready
Nuclear_War:_A_Scenario
Spread of nuclear weapons
Nuclear proliferation is the spread of nuclear weapons to additional countries, particularly those not recognized as nuclear-weapon states by the Treaty
Nuclear_proliferation
Doctrine of military strategy
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
Mutually_assured_destruction
French nuclear deterrence force
French nuclear deterrence force. Formulated immediately after the Second World War, it comprised a triad of air-, sea- and land-based nuclear weapons intended
Force_de_dissuasion
2008 video game
superweapons. Weapon types are specialized to the point where a rifleman can withstand direct hits from an anti-tank cannon. Red Alert 3's major refinements
Command & Conquer: Red Alert 3
Command_&_Conquer:_Red_Alert_3
1945–1946 sphere of plutonium
bomb. It was manufactured in 1945 by the Manhattan Project, the U.S. nuclear weapon development effort during World War II. It was a subcritical mass that
Demon_core
Set of three types of nuclear-strike standoff weapons
Despite becoming the third nuclear power in 1952, the United Kingdom has never operated a triad. Israel likely possesses weapons in a triad structure, but
Nuclear_triad
Method to delay nuclear weapon launch time
to use nuclear weapons in combat. Because thousands of strategic nuclear warheads mounted on ballistic missiles remain on high-alert, launch-ready status
De-alerting
2025 American military action
Iran's ability to weaponize the nuclear reprocessing of spent nuclear fuel into fissile material through safeguards, Pahlavi handed nuclear-construction contracts
2025 United States strikes on Iranian nuclear sites
2025_United_States_strikes_on_Iranian_nuclear_sites
Accidental damage to nuclear weapons, RAF Lakenheath, Suffolk, United Kingdom
store nuclear weapons during the Cold War, was the site of accidents involving nuclear weapons, in 1956 and 1961. The first of two recorded nuclear near-accidents
RAF Lakenheath nuclear weapons accidents
RAF_Lakenheath_nuclear_weapons_accidents
Proposed multilateral treaty
convention text requires countries with nuclear weapons to destroy them in stages, including taking them off high alert status, removing them from deployment
Nuclear_weapons_convention
Arrow (nuclear) International Nuclear Event Scale List of accidents and incidents involving military aircraft Lists of disasters Nuclear weapon Radiation
List of military nuclear accidents
List_of_military_nuclear_accidents
1996 video game
Command & Conquer: Red Alert is a real-time strategy video game in the Command & Conquer franchise, developed and published by Westwood Studios in 1996
Command_&_Conquer:_Red_Alert
United States federal government agency
military application of nuclear science. NNSA maintains and enhances the safety, security, and effectiveness of the U.S. nuclear weapons stockpile; works to
National Nuclear Security Administration
National_Nuclear_Security_Administration
Incident which nearly precipitated nuclear warfare
month after the Petrov incident Dead Hand – Soviet nuclear weapons-control system List of nuclear close calls Norwegian rocket incident – a rocket carrying
1983 Soviet nuclear false alarm incident
1983_Soviet_nuclear_false_alarm_incident
1968 aviation accident
clean-up and recovery operation, but the secondary stage of one of the nuclear weapons could not be accounted for after the operation was completed. USAF
1968 Thule Air Base B-52 crash
1968_Thule_Air_Base_B-52_crash
1960s US military operation patrolling Soviet territory
of US nuclear weapons still on the ground. The operation also ensured that Strategic Air Command bomber crews had experience with airborne alert procedures
Operation_Chrome_Dome
1995 misidentification of sounding rocket
missile. Fearing a high-altitude nuclear attack that could blind Russian radar, Russian nuclear forces went on high alert, and the "nuclear briefcase" (the
Norwegian_rocket_incident
Preemptive attack using nuclear weapons
cripple another nuclear power's second strike retaliatory capacity. The preferred methodology is to attack the opponent's strategic nuclear weapon facilities
First strike (nuclear strategy)
First_strike_(nuclear_strategy)
and the eighth to openly test nuclear weapons. On 3 October 2006, North Korea announced its intention to conduct a nuclear test. The blast is generally
2006 North Korean nuclear test
2006_North_Korean_nuclear_test
Nuclear weapon control system
strategic nuclear weapon nuclear command and control (NC2) system, an Emergency Action Message (EAM) is a preformatted message that directs nuclear-capable
Emergency_Action_Message
Response to a powerful first nuclear strike
specifically designed to withstand a nuclear attack.[citation needed] Launch on warning is a strategy of nuclear weapon retaliation that gained recognition
Second_strike
Type of radiological weapon
administrators said that high-efficiency nuclear weapon design could create explosions that generated almost all of their energy in the form of nuclear fusion, which
Dirty_bomb
Aspect of Japan's military history
biological weapons (CBW) during the Second Sino-Japanese War as part of Japanese war crimes. Japan is the only country ever attacked with nuclear weapons, by
Japan and weapons of mass destruction
Japan_and_weapons_of_mass_destruction
UK Ministry of Defence facility
AWE Nuclear Security Technologies, formerly known as the Atomic Weapons Establishment (AWE), is a United Kingdom Ministry of Defence research facility
AWE Nuclear Security Technologies
AWE_Nuclear_Security_Technologies
American ICBM
Minuteman ICBM was first placed on alert, the Soviet Union did not have the number of weapons, accuracy, nor significant nuclear yield to completely destroy
LGM-30_Minuteman
Chronology of the North Korean nuclear program
phase IV (2002–present) covers the current period of renewed nuclear activities. Nuclear weapon warhead designs fall into various categories. Fission devices
Timeline of the North Korean nuclear program
Timeline_of_the_North_Korean_nuclear_program
2000 video game
Red Alert 2 is a real-time strategy video game released for Microsoft Windows on October 25, 2000, as the follow-up to Command & Conquer: Red Alert. Red
Command & Conquer: Red Alert 2
Command_&_Conquer:_Red_Alert_2
Action only authorized by two or more people
concept" is designed to prevent accidental or malicious launch of nuclear weapons by a single individual. In the case of Minuteman missile launch crews
Two-person_rule
Koreans conducted the nuclear test to show that, even in a time of possible weakness, it did not intend to give up its nuclear weapons program. North Korea
2009 North Korean nuclear test
2009_North_Korean_nuclear_test
Jet fighter aircraft
Although they never fired a weapon in wartime, the CF-101 served as Canada's primary means of air defence from Quick Reaction Alert facilities at Canadian
McDonnell_CF-101_Voodoo
Nuclear strategy
warning, is a strategy of nuclear weapon retaliation where a retaliatory strike is launched upon warning of enemy nuclear attack and while its missiles
Launch_on_warning
First Chinese nuclear test, 1964
callsign; Chic-1 by the US intelligence agencies) was the first nuclear test of the nuclear weapons program of China, detonated on 16 October 1964, at the Lop
Project_596
Soviet Union program to develop nuclear weapons during and after World War II
Soviet Union to develop nuclear weapons during and after World War II. Physicist Georgy Flyorov, suspecting a Western Allied nuclear program, urged Stalin
Soviet_atomic_bomb_project
Device for controlled nuclear reactions
Canada halted nuclear dealings with India following the 1974 Smiling Buddha nuclear weapon test. Reaktor Bolshoy Moschnosti Kanalniy (High Power Channel
Nuclear_reactor
1961–2003 US nuclear strategy document
procedures and target sets against which nuclear weapons would be launched. The plan integrated the capabilities of the nuclear triad of strategic bombers, land-based
Single Integrated Operational Plan
Single_Integrated_Operational_Plan
fiction, uses the aftermath of nuclear or biological warfare as its setting. The Death Star is the Star Wars equivalent to a weapon of mass destruction, and
Weapons_in_science_fiction
1945 attacks in Japan during WWII
Boy", an enriched uranium gun-type fission weapon, and "Fat Man", a plutonium implosion-type nuclear weapon. The 509th Composite Group of the U.S. Army
Atomic bombings of Hiroshima and Nagasaki
Atomic_bombings_of_Hiroshima_and_Nagasaki
Intercontinental ballistic missile
ICBMs has prompted the Air Force to keep them on high alert, which is dangerous and could trigger a nuclear war. According to William Hartung, author of Prophets
LGM-35_Sentinel
British nuclear weapon
Violet Club was a nuclear weapon deployed by the United Kingdom during the Cold War; the name was chosen in adherence to the Rainbow code system. It was
Violet_Club
educate people on the affects and preparedness associated with nuclear weapons, the "Alert America" program also showed federally supported films such as
Civil defense in the United States
Civil_defense_in_the_United_States
US Air Force incident involving a nuclear bomb
functional nuclear weapon, but others refer to it as disabled. If it had a plutonium nuclear core installed, it was a fully functional weapon. If it had
1958 Tybee Island mid-air collision
1958_Tybee_Island_mid-air_collision
US government protocol against a nuclear attack
Nuclear weapons materials on the black market are a global concern, and there is concern about the possible detonation of a small, crude nuclear weapon by
National Response Scenario Number One
National_Response_Scenario_Number_One
British organisation advocating unilateral nuclear disarmament
such as the Nuclear Non-Proliferation Treaty. It opposes military action that may result in the use of nuclear, chemical or biological weapons, and the building
Campaign for Nuclear Disarmament
Campaign_for_Nuclear_Disarmament
Family of Israeli ballistic missiles
signal to the US. U.S. Secretary of State Henry Kissinger learned of the nuclear alert on the morning of October 9. That day, in keeping with his deal and
Jericho_(missile)
all nuclear weapons, 59 percent support removing all nuclear weapons from high alert, and 53 percent support cutting the Russian and U.S. nuclear arsenals
Public opinion on nuclear issues
Public_opinion_on_nuclear_issues
US strategic communications system
in nuclear warfare to maintain communications between the decision-makers (the National Command Authority) and the triad of strategic nuclear weapon delivery
TACAMO
Reaction that combines atomic nuclei
conditions occur only in, thermonuclear weapons and boosted fission weapons, and fusion power experiments. A nuclear fusion process that produces atomic nuclei
Nuclear_fusion
Symbol which represents the likelihood of a human-made global catastrophe
possibility of nuclear war by accident or miscalculation". The clock was left unchanged in 2019 due to the twin threats of nuclear weapons and climate change
Doomsday_Clock
Arabia maintains a nuclear weapons program. From an official and public standpoint, Saudi Arabia has been an opponent of nuclear weapons in the Middle East
Nuclear program of Saudi Arabia
Nuclear_program_of_Saudi_Arabia
Policy on use of nuclear weapons
by a nuclear power not to initiate the use of nuclear weapons. Such a pledge would allow for a unique state of affairs in which a given nuclear power
No_first_use
Russian strategic bomber aircraft
the Kh-55 nuclear-armed cruise missile and Kh-101 stealth cruise missile. Soviet crews carried out long-range patrols, without nuclear weapons, until 1991
Tupolev_Tu-95
country to develop and test nuclear weapons, after the United States and Soviet Union. and is one of the five nuclear-weapon states under the Treaty on
Timeline of strategic nuclear weapon systems of the United Kingdom
Timeline_of_strategic_nuclear_weapon_systems_of_the_United_Kingdom
NATO command post exercise in 1983
were placed "on high alert status with readying of nuclear strike forces". A 1989 US memorandum said that Soviet commanders ordered nuclear warheads to be
Able_Archer_83
Atomic weapons tests in Australia, 1956–1963
nuclear weapon was compressed by the high explosive shock wave; and "Vixens" investigated the effects of fire or non-nuclear explosions on atomic weapons. The
British nuclear tests at Maralinga
British_nuclear_tests_at_Maralinga
Civilian command facility for the Federal Emergency Management Agency
"Mount Weather / High Point Special Facility (SF) / Western Virginia Office of Controlled Conflict Operations - United States Nuclear Forces". fas.org
Mount Weather Emergency Operations Center
Mount_Weather_Emergency_Operations_Center
American strategic bomber
prevent nuclear weapon pylons from being attached, removal of weapons bay wiring bundles for arming nuclear weapons, and destruction of nuclear weapon pylons
Rockwell_B-1_Lancer
Tactical ballistic missile
short-range, nuclear-armed tactical surface-to-surface ballistic missile. It was the first guided weapon authorized by the United States to carry a nuclear warhead
MGM-5_Corporal
Spanish nuclear weapons program (1963–1987)
1987 under Felipe González. Although the project never developed a nuclear weapon, the country possessed the capabilities to both design and manufacture
Project_Islero
United States Air Force base in Albuquerque, New Mexico
Materiel Command's Nuclear Weapons Center (NWC). The NWC's responsibilities include acquisition, modernization and sustainment of nuclear system programs
Kirtland_Air_Force_Base
Metastable excited state of a nuclide
of both nuclear isomers. The potential to trigger an abrupt release of energy from nuclear isotopes, a prerequisite to their use in such weapons, is disputed
Nuclear_isomer
Movement opposing the use of nuclear power, weapons, and/or uranium mining
The anti-nuclear movement in the United States consists of more than 80 anti-nuclear groups that oppose nuclear power, nuclear weapons, and/or uranium
Anti-nuclear movement in the United States
Anti-nuclear_movement_in_the_United_States
2025 war in West Asia
weapons development. In 2015, under the Joint Comprehensive Plan of Action (JCPOA), six countries lifted sanctions on Iran, which froze its nuclear program
Twelve-Day_War
Military airfield in Belgium
stockpiled nuclear weapons intimidate the other side and, thus prevent a war from occurring. KB was one of the bases on Quick Reaction Alert. At some points
Kleine-Brogel_Air_Base
1969 secret U.S. nuclear alert operation
Operation Giant Lance was a secret U.S. nuclear alert operation by the United States that the Strategic Air Command carried out in late October 1969.
Operation_Giant_Lance
Radioactive isotope of caesium
fission products by the nuclear fission of uranium-235 and other fissionable isotopes in nuclear reactors and nuclear weapons. Trace quantities also originate
Caesium-137
Class of units of measurement for explosive energy
respectively. During the nuclear arms race, thermonuclear weapons were developed with yields in the megaton range. The largest nuclear weapon ever tested was the
TNT_equivalent
Using poison gas or other toxins in war
and nuclear (warfare or weapons), all of which are considered "weapons of mass destruction" (WMDs), a term that contrasts with conventional weapons. The
Chemical_warfare
Difference between physical inventory of nuclear material and book inventory
(MUF), in the context of nuclear material, refers to any discrepancy between a nuclear-weapons state's physical inventory of nuclear material, and the book
Material_unaccounted_for
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HIGH ALERT-NUCLEAR-WEAPON
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HIGH ALERT-NUCLEAR-WEAPON
HIGH ALERT-NUCLEAR-WEAPON
HIGH ALERT-NUCLEAR-WEAPON
HIGH ALERT-NUCLEAR-WEAPON
HIGH ALERT-NUCLEAR-WEAPON
HIGH ALERT-NUCLEAR-WEAPON
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