Eight Times the World Nearly Stumbled Into Nuclear War — And What Could Trigger It Next
Humanity has lived with nuclear weapons for more than 80 years. The extraordinary fact is not simply that they have never been used in war since Hiroshima and Nagasaki. It is how many times governments, soldiers, computers and warning systems have brought the world frighteningly close to using them again.
Some crises involved presidents consciously weighing military actions that could have escalated into nuclear exchange. Others were stranger and arguably more disturbing: a malfunctioning computer, sunlight reflected from clouds, a scientific rocket mistaken for an incoming missile, or a military exercise interpreted as preparation for a real attack.
The danger has not disappeared. At the beginning of 2026, the world's nine nuclear-armed states possessed an estimated 12,187 nuclear weapons.
Around 4,012 were deployed with operational forces and roughly 2,100–2,200 were maintained on ballistic missiles at high operational alert. Russia and the United States still dominate the global stockpile, while China is expanding rapidly and India, Pakistan and North Korea continue developing their forces.
So which incidents really brought humanity closest to nuclear war?
There can be no mathematically definitive ranking because historians cannot know what leaders would have done in alternative timelines.
But judged by proximity to actual nuclear use, military readiness, time pressure, misunderstanding and the likelihood that one further escalation could have triggered retaliation, these stand above the rest.