A reading note  ·  Pol Science Long Read

The Nuclear Age
1945 – 2026

From Trinity to the current standoff — the tests, treaties, near-misses, and proliferation that have kept the world one miscalculation from catastrophe.

2,056 Nuclear tests
conducted globally

9 States with
nuclear weapons

~12,100 Warheads
still in existence

0 Times used
in war since 1945

test / detonation

treaty / agreement

crisis / near-miss

proliferation

accident / leak

1945

Birth of the Bomb

Jul 1945

Trinity Test — New Mexico

The first nuclear detonation in history. A plutonium implosion device yields ~21 kilotons. Oppenheimer recalls the Bhagavad Gita: "Now I am become Death, the destroyer of worlds."

Aug 1945

Hiroshima & Nagasaki

Little Boy destroys Hiroshima on 6 August. Fat Man destroys Nagasaki on 9 August. Approximately 200,000 people die. Japan surrenders. The atomic bomb enters history as a weapon actually used on human beings.

~200,000 dead

1949

The Arms Race

1949

USSR Tests Its First Bomb — Joe-1

The Soviet Union breaks the US monopoly four years after Hiroshima, aided partly by intelligence from Klaus Fuchs. Washington is shocked. The arms race begins in earnest. Containment becomes existential.

1952

US Tests First Hydrogen Bomb — Ivy Mike

A thermonuclear device yields 10.4 megatons — 700 times Hiroshima. The island of Elugelab is vaporised. The scale of potential destruction moves beyond comprehension. The USSR matches it within a year.

1952

Britain Becomes Third Nuclear Power

Operation Hurricane tests a plutonium bomb off Western Australia. Britain joins the nuclear club, determined to maintain great-power status in the post-imperial era.

1954

Castle Bravo — Worst US Test

A hydrogen bomb test in the Marshall Islands yields 15 megatons — 2.5 times the expected yield. Radioactive fallout contaminates 7,000 square miles, sickens the crew of a Japanese fishing vessel, and triggers global anti-nuclear protests.

1957–60

France & China Enter the Club

France tests in 1960 in Algeria; China tests in 1964 in Xinjiang. The club of nuclear states expands beyond the Anglo-American alliance. Non-proliferation becomes an urgent political problem.

1960s

Near Catastrophe

1961

Goldsboro B-52 Crash — North Carolina

A US bomber breaks apart mid-air and drops two 4-megaton hydrogen bombs on North Carolina. One bomb went through five of its six safety interlocks before the final switch held. A near-accidental detonation over American soil.

Oct 1962

Cuban Missile Crisis

The closest the world has come to nuclear war. Soviet missiles in Cuba, US naval blockade, thirteen days of secret negotiations. The crisis is resolved — but we now know Soviet submarine B-59 came within one officer's veto of launching a nuclear torpedo. That officer was Vasili Arkhipov.

Arkhipov's veto may have saved the world

1963

First Treaties

1963

Partial Test Ban Treaty (PTBT)

US, USSR, UK agree to ban nuclear tests in the atmosphere, underwater, and in space. Underground tests are still permitted. Driven partly by Castle Bravo's fallout and public outcry over contaminated milk. The first arms control success.

1967

Outer Space Treaty

Bans nuclear weapons in orbit or on celestial bodies. Signed by the US, USSR, UK and eventually over 100 states. Space remains — for now — a nuclear-weapon-free zone.

1968

Nuclear Non-Proliferation Treaty (NPT)

The cornerstone of the international non-proliferation regime. Nuclear states agree not to transfer weapons; non-nuclear states agree not to acquire them; all parties agree to pursue disarmament. The disarmament clause has never been seriously implemented.

191 states party — India, Pakistan, Israel never signed

1970s

Détente & Arms Control

1972

SALT I & ABM Treaty

Nixon and Brezhnev sign the first Strategic Arms Limitation Talks agreement, capping offensive missiles. The Anti-Ballistic Missile Treaty bans missile defence systems — the logic being that defence destabilises deterrence by making a first strike seem survivable.

1979

SALT II

Carter and Brezhnev sign further limits on strategic warheads. The US Senate never ratifies it after the Soviet invasion of Afghanistan. Both sides observe it informally for years — a revealing precedent about how arms control actually works.

1979

Three Mile Island

Partial meltdown at a Pennsylvania reactor. No direct deaths, but it ends the US nuclear energy boom. Public fear of the atom — weapons and power alike — crystallises into lasting political opposition.

1980s

Late Cold War — Peak Arsenals

1983

Able Archer 83 & Petrov Incident

NATO's realistic war exercise convinces Soviet leadership a nuclear first strike may be imminent. Separately, Soviet early-warning officer Stanislav Petrov detects what appears to be five incoming US missiles and correctly judges it a false alarm — rather than following protocol and reporting it up the chain.

Arsenals at peak: ~70,000 warheads combined

1986

Chernobyl Disaster

Reactor No. 4 at the Chernobyl plant in Ukraine explodes. Radioactive fallout spreads across Europe. The catastrophe exposes the USSR's systemic failures and accelerates Gorbachev's glasnost. It also poisons the political future of nuclear energy for a generation.

1987

INF Treaty — Reagan & Gorbachev

The Intermediate-Range Nuclear Forces Treaty eliminates an entire class of land-based missiles. The first agreement to actually destroy weapons rather than merely cap them. A landmark — and one the US withdraws from in 2019, citing Russian violations.

1991

Post-Cold War Reductions

1991

START I

Bush and Gorbachev sign the Strategic Arms Reduction Treaty — the first agreement to actually reduce, not merely limit, strategic warheads. Both sides cut to 6,000 deployed warheads. The post-Cold War arms control era begins with genuine optimism.

1991–94

Soviet Collapse & Nuclear Inheritance

The USSR's dissolution leaves nuclear weapons scattered across Russia, Ukraine, Belarus, and Kazakhstan. The US funds the Nunn-Lugar programme to secure and dismantle them. Ukraine gives up the world's third-largest arsenal in exchange for security guarantees — a decision that haunts the country after 2014.

1996

Comprehensive Test Ban Treaty (CTBT)

Bans all nuclear explosions. Signed by 187 states. Never entered into force because eight key states — including the US, China, India, Pakistan — have not ratified it. Tests have mostly stopped; the legal architecture remains incomplete.

1998

New Proliferation

1998

India & Pakistan Test — Pokhran & Chagai

India conducts five tests in May; Pakistan responds with six. Two hostile neighbours with unresolved territorial disputes now openly possess nuclear weapons. The subcontinent becomes the most dangerous nuclear flashpoint on earth.

Both refuse NPT accession

2003–06

North Korea Withdraws from NPT & Tests

Pyongyang withdraws from the NPT in 2003 — the first state ever to do so. It conducts its first nuclear test in 2006. Subsequent tests in 2009, 2013, 2016, and 2017 progressively demonstrate increasing yield. North Korea is now a de facto nuclear state.

2002–present

Iran Nuclear Crisis

Iran's uranium enrichment programme triggers a two-decade confrontation with the West. The JCPOA agreement of 2015 limits enrichment in exchange for sanctions relief; the US withdraws in 2018 under Trump. Iran enriches uranium to 60% purity by 2023 — near weapons-grade.

2010s

Erosion of the Framework

2010

New START Treaty

Obama and Medvedev reduce deployed strategic warheads to 1,550 each. The last surviving major bilateral arms control agreement between the US and Russia. Russia suspends its participation in February 2023, citing the war in Ukraine.

2017

Treaty on the Prohibition of Nuclear Weapons

The UN adopts the first treaty to comprehensively ban nuclear weapons. 93 signatories, mostly from the Global South. No nuclear-armed state has signed or acknowledged its legitimacy. A moral statement rather than a practical constraint — but a statement nonetheless.

2019

US Withdraws from INF Treaty

The Trump administration exits the landmark 1987 agreement, citing Russian violations with the SSC-8 missile. Russia responds by suspending its own participation. The legal architecture that eliminated an entire class of missiles collapses. Both sides begin developing new intermediate-range weapons.

2022

The Present Danger

2022

Putin's Nuclear Threats — Ukraine War

As Russia's invasion of Ukraine falters, Putin issues repeated nuclear warnings — the most overt nuclear threats from a major power since the Cold War. Western governments privately assess the risk as real. The taboo against nuclear use is tested more openly than at any point since 1962.

2023

Russia Stations Tactical Nukes in Belarus

Russia deploys tactical nuclear weapons to Belarus — the first time Moscow has stationed nuclear weapons outside Russian territory since the Soviet collapse. A deliberate signal to NATO's eastern flank.

2024

China's Arsenal Expansion

US intelligence confirms China is rapidly expanding its nuclear forces, constructing hundreds of new missile silos. The Pentagon estimates China could have 1,000 warheads by 2030. For the first time, the US faces the prospect of two peer nuclear adversaries simultaneously.

China: ~500 warheads (est. 2024)

2025–26

No Treaty, No Talks, No Architecture

New START has lapsed. The INF is dead. The CTBT is unratified. US-Russia arms control dialogue is frozen. US-China nuclear talks have barely begun. Three nuclear powers — US, Russia, China — possess modernising arsenals with no binding legal constraints between them for the first time since 1972. The world is more nuclear-precarious than it has been in forty years.

~12,100 warheads remain globally