From Hiroshima and Nagasaki to Ukraine, Iran and AI warfare, the world is confronting nuclear dangers once thought safely contained.

By Mitin Rajkuumar Sheth (Shanilohit)

Senior Columnist | Author | Geopolitical Analyst | Strategic Book Reviewer

                                 Published:  August 9, 2026

                  Estimated Reading Time: 11–12 minutes

Executive Summary

“As the world marks the 81st anniversary of the Nagasaki atomic bombing on August 9, the international security environment offers uncomfortable reasons to revisit the lessons of 1945.”

Russia’s revised nuclear doctrine has widened the circumstances under which Moscow says nuclear use could be considered, although the often-used description “escalate to de-escalate” remains debated among experts.

Meanwhile, the U.S.–Iran war has demonstrated how quickly a regional confrontation can disrupt one of the world's most important energy corridors. The Strait of Hormuz historically carries roughly one-fifth of global petroleum liquids consumption, and the 2026 conflict has already sharply reduced energy flows through the region.

A third danger is emerging from technology itself. Artificial intelligence may improve early warning and intelligence analysis, but integrating it into nuclear-related systems also creates new risks involving automation bias, cyber manipulation, false warnings, and compressed decision-making. SIPRI has warned that no dedicated international governance framework yet adequately addresses the AI–nuclear nexus.

The greatest danger may therefore not be a deliberate decision to begin an all-out nuclear war. It may be the belief that one limited nuclear use could remain limited.

Introduction

History rarely repeats itself in precisely the same form, but it often returns through familiar and dangerous patterns.

Eighty-one years ago, the atomic bombings of Hiroshima and Nagasaki demonstrated that humanity had acquired the ability to destroy cities in minutes and potentially civilization itself through escalation. The attacks helped bring the Pacific War to an end, but they also opened the nuclear age—an era in which peace among major powers would increasingly depend on the fear of consequences too terrible to contemplate.

For decades, that fear helped sustain what scholars came to call the nuclear taboo: the powerful political, military and moral restraint against using nuclear weapons in war.

In 2026, however, that restraint is being tested by a far more complicated international environment. Russia’s war against Ukraine continues. The United States and Iran are engaged in a direct conflict that has already disrupted shipping and energy markets around the Strait of Hormuz. Nuclear arsenals are being modernised, military artificial intelligence is advancing, and decision-making time in a major crisis could become dangerously compressed.

The question is therefore no longer confined to history books:

Could a nuclear weapon be used again—and if it were, could escalation still be controlled?

 From the Manhattan Project to Hiroshima and Nagasaki

Certain dates become permanent markers in human history. August 6 and August 9, 1945 are among them.

The road to the atomic bomb began before the United States entered the Second World War. Scientists had discovered nuclear fission, and fears grew that Nazi Germany might attempt to turn the new science into a weapon. In August 1939, Albert Einstein signed the famous letter to President Franklin D. Roosevelt—largely initiated and drafted by physicist Leo Szilard—warning of uranium's military potential and the possibility of German research in the field.

That warning helped accelerate American interest in nuclear research. Eventually, the United States launched the vast and secret Manhattan Project, bringing together scientists, engineers, military officers and industrial facilities across the country.

J. Robert Oppenheimer became scientific director of the Los Alamos laboratory, while General Leslie Groves headed the overall project.

On July 16, 1945, the world's first nuclear device was detonated during the Trinity test in New Mexico.

Humanity had crossed a threshold from which there would be no return.

Germany had already surrendered, but the Pacific War continued. Japanese resistance had been fierce, and American planners anticipated extremely heavy casualties if Allied forces invaded the Japanese home islands under the planned Operation Downfall.

Casualty estimates for such an invasion varied considerably. This matters because the historical debate over the decision to use the atomic bombs remains complex. Ending the war rapidly, avoiding the enormous costs of invasion, Japan's internal political situation, the Soviet Union's entry into the war against Japan, and the strategic implications of the new weapon all shape that continuing debate.

On August 6, the B-29 Enola Gay dropped the uranium-based Little Boy bomb over Hiroshima.

Three days later, on August 9, the plutonium-based Fat Man bomb was dropped on Nagasaki.

The immediate effects were catastrophic: blast, heat, fire and radiation devastated both cities. Tens of thousands died quickly, while many others died later from injuries and radiation-related illness. By the end of 1945, estimates commonly place the combined death toll well above 100,000, with longer-term health consequences continuing afterwards.

Japan announced its surrender on August 15. The Second World War was ending. The nuclear age was beginning.

The Nuclear Taboo Under Pressure

No nuclear weapon has been used in warfare since Nagasaki.

That fact is one of the most remarkable features of the post-1945 international system.

Nuclear powers accumulated arsenals capable of destroying one another many times over, yet deterrence rested precisely on the knowledge that actual use could trigger consequences impossible to control.

This became closely associated with Mutually Assured Destruction (MAD) during the Cold War: a large-scale nuclear attack would invite devastating retaliation, leaving no meaningful victor.

But tactical—or more accurately, non-strategic nuclear weapons—complicate this logic.

These weapons are generally intended for more limited military objectives than strategic systems designed to strike an opponent's homeland, command structure or nuclear forces. Their yields vary widely, and the distinction between “tactical” and “strategic” is not simply a matter of explosive power.

That distinction is critical.

Calling a nuclear weapon “tactical” can create the dangerous impression that its consequences would somehow be manageable.

They may not be.

A nuclear detonation against military forces could still kill civilians, spread radioactive fallout, trigger retaliation and cross the political threshold separating conventional warfare from nuclear warfare.

Once that threshold is crossed, no military planner can guarantee where escalation ends.

Russia, Ukraine and the Nuclear Threshold

Russia's war in Ukraine has brought nuclear deterrence back into European strategic thinking.

Moscow revised its publicly stated nuclear doctrine in November 2024. The revised formulation expanded the circumstances under which nuclear use might be considered, including certain conventional attacks judged to pose a critical threat to Russian sovereignty or territorial integrity.

Western officials have sometimes characterised Russian thinking as “escalate to de-escalate”—the idea that limited nuclear use might compel an opponent to back down.

That description, however, should not be presented as uncontested Russian doctrine. Nuclear experts continue to debate whether the phrase accurately describes Moscow's actual strategy.

The distinction matters because nuclear analysis should not turn uncertainty into certainty.

What is clear is that the Ukraine war has created repeated opportunities for escalation between Russia and NATO-backed Ukraine.

Yet even if Russia were ever to employ a non-strategic nuclear weapon, NATO would not automatically be required to enter a nuclear war. The political and military response would depend on circumstances, target, casualties and allied decisions.

This uncertainty may itself be part of deterrence.

The frightening element is that neither Moscow nor NATO can know with confidence how the other side would respond after the nuclear threshold had been crossed.

The U.S.–Iran War: A Different Nuclear Danger

The Middle East presents a different strategic problem.

By August 2026, confrontation between Washington and Tehran can no longer accurately be described simply as a proxy struggle. The conflict that began in February has involved direct U.S. and Israeli action against Iran, Iranian retaliation and severe disruption around the Strait of Hormuz. Reuters reported on August 8 that negotiations involving Iran and Oman were progressing, but Tehran continued to link reopening the waterway to broader conditions involving the United States.

This changes the nuclear discussion.

The United States possesses an overwhelming nuclear arsenal, but that does not mean nuclear use against Iran is a natural or likely extension of conventional military operations.

Nor should conventional bunker-buster weapons be confused with tactical nuclear weapons. The United States possesses powerful conventional earth-penetrating weapons designed for hardened underground targets. Nuclear earth-penetrating concepts belong to a different category entirely.

The more immediate nuclear concern is escalation: whether a prolonged regional war, attacks on critical infrastructure, uncertainty over Iran's nuclear capabilities, or a severe military shock could push decision-makers toward options previously considered politically unacceptable.

The U.S.–Iran conflict has already imposed high costs. Reuters reported this week that the five-month war has depleted substantial quantities of American long-range precision weapons and air-defence interceptors.

Military strain does not make nuclear use inevitable.

But prolonged wars can alter political calculations—and history warns against assuming that today's red lines will automatically remain tomorrow's.

(From the nuclear legacy of 1945 to the interconnected risks of 2026—regional wars, tactical weapons, maritime disruption and AI-driven military systems.)

Hormuz: When Military Escalation Becomes an Economic Weapon

The Strait of Hormuz demonstrates why a Middle Eastern conflict cannot remain merely regional.

Before the current disruption, approximately 20% of global petroleum liquids consumption passed through the strait, while Asian markets received the overwhelming majority of crude oil and condensate moving through it. China, India, Japan and South Korea were among the principal destinations.

The 2026 conflict has already demonstrated that vulnerability in the real world. EIA data show Hormuz oil flows fell sharply in the first quarter of 2026, while subsequent disruption contributed to major reductions in Middle Eastern production and shipments.

A nuclear event in or near this region would multiply the uncertainty.

Shipping companies would have to consider radiation hazards as well as missiles, mines and drones. Marine insurance costs could surge. Ports might close. Governments could impose exclusion zones. Energy prices could rise sharply while alternative pipelines and shipping routes absorbed only part of the lost capacity.

For India, this would matter even more.

Energy security, shipping costs, inflation and industrial supply chains are all tied to stability in the Gulf and Indian Ocean.

A nuclear crisis in the Middle East would therefore not be somebody else's distant war.

Its economic consequences could arrive in Indian households long before radioactive fallout ever did.

Artificial Intelligence Enters the Nuclear Equation

The nuclear age of 2026 differs fundamentally from that of 1945—and even from much of the Cold War.

Artificial intelligence is increasingly being incorporated into military intelligence, surveillance, early warning, autonomous systems and decision-support architecture.

AI can offer enormous advantages. It can process sensor data faster than human analysts, identify patterns across large datasets and help commanders understand complex threats.

But speed is not always synonymous with safety.

An AI-supported warning system can still operate on incomplete, manipulated or ambiguous information. Cyberattacks could corrupt data. Drone swarms and large conventional missile attacks could complicate early-warning environments. Human operators may also develop automation bias—placing excessive confidence in recommendations generated by sophisticated systems.

SIPRI has highlighted precisely this emerging problem, noting both the potential strategic-stability risks of AI integration and the absence of a dedicated governance framework addressing the AI–nuclear relationship.

This does not mean an AI system is about to launch a nuclear weapon independently.

That would be an exaggerated claim.

The more realistic danger is subtler: machines may increasingly shape the information presented to the human beings who must make decisions under extraordinary pressure.

If technology compresses the time available to determine whether an attack is real, whether data have been manipulated and whether retaliation is justified, the margin for human judgment becomes dangerously narrow.

In nuclear deterrence, a few additional minutes of doubt can be a safeguard.

Removing those minutes may not be progress.

The Real Danger: The Myth of a “Small” Nuclear War

The greatest nuclear misconception of the modern era may be the idea that a limited nuclear weapon necessarily produces a limited political result.

A battlefield nuclear strike might be smaller than a strategic attack on a city.

But the first nuclear detonation in war since 1945 would instantly transform international politics.

Markets would react. Military forces would move to higher alert. Governments would reassess their security. Non-nuclear states might begin questioning whether they too required nuclear deterrents.

Most dangerously, the opponent would have to decide whether failing to retaliate invited further nuclear attacks.

This is why the nuclear taboo matters.

It is not merely a moral principle.

It is a strategic barrier separating an international system in which nuclear weapons deter war from one in which nuclear weapons become instruments for fighting wars.

Once that barrier is broken, rebuilding it may be impossible.

Conclusion: The Warning from Nagasaki

The lesson of August 9, 1945 is not simply that nuclear weapons are extraordinarily destructive.

It is that technological power can create political consequences that no generation can completely reverse.

For 81 years, the world has lived with nuclear weapons without seeing another one detonated in war. That record should not create complacency. It should remind us how valuable restraint has been.

Today's danger comes from several directions at once: prolonged conventional wars, weakened arms-control structures, increasingly explicit nuclear signalling, regional instability, cyber threats and rapidly advancing artificial intelligence.

None of these makes nuclear war inevitable.

But together they make responsible decision-making more important than ever.

The most dangerous assumption leaders could make is that a tactical nuclear weapon could be used once, in one place, for one limited purpose—and that everyone else would calmly accept the boundary.

History offers no such guarantee.

The nuclear taboo has survived since Nagasaki. This generation's task is to ensure it survives the next crisis as well.

About the Author

Mitin Rajkuumar Sheth (Shanilohit) is an Indian author, geopolitical analyst and strategic book reviewer who has been associated with the Janmabhoomi Group of Newspapers as a freelance Senior Columnist for more than 25 years. His writing focuses on international affairs, defence and military strategy, global security, emerging technologies and India's evolving role in the international order.

Selected References

U.S. Department of Energy — “The Manhattan Project: EM’s Origin Story” — Manhattan Project, Trinity Test and the beginning of the nuclear age.

SIPRI — “Advancing Governance at the Nexus of Artificial Intelligence and Nuclear Weapons” — AI integration, nuclear decision-making and strategic-stability risks. 

Arms Control Association — “Putin’s Decision to Lower Threshold for Nuclear Use Is Irresponsible and Dangerous” — Analysis of Russia’s November 2024 revised nuclear doctrine. 

U.S. Energy Information Administration — “World Oil Transit Chokepoints” — Strait of Hormuz oil/LNG flows and its importance to Asian energy markets. 

Reuters, August 8, 2026 — Current reporting on Iran, Oman and negotiations concerning the Strait of Hormuz. Reuters reported that Iran said an agreement with Oman was close, while reopening the waterway remained tied to broader conditions involving the United States. 

Reuters, August 4, 2026 — Reporting on pressure on U.S. long-range precision-munition and air-defence inventories during the Iran war.

 Disclaimer

This article is an independent geopolitical and strategic analysis prepared for informational and educational purposes. It is based on publicly available information, official data and open-source reporting available at the time of publication. References to nuclear doctrine, military options or possible escalation scenarios are analytical and do not imply that any government has decided to employ nuclear weapons. The article neither advocates nor endorses military action or the use of weapons of mass destruction. Because the international security environment is rapidly evolving, readers should consult current official and independent sources for subsequent developments.

Editorial Transparency

This is an independently researched and authored analysis. Advanced digital tools and AI were used solely for supplementary support tasks, including research cross-referencing, translation verification, image generation, and grammatical refinement. The core analytical insights, strategic conclusions, and creative direction are entirely the author's own.

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© 2026 Mitin Rajkuumar Sheth (Shanilohit). All Rights Reserved.

No part of this article may be reproduced or republished in substantial form without prior written permission, except for brief quotations with appropriate attribution and a link to the original publication.