From theoretical physics to global stockpiles: the evolution of the nuclear age

History · Published 3 October 2026 Swipe more like this →

In short: Nuclear weapons derive their immense power from the splitting or fusing of atoms, a process that transformed warfare in 1945. Since the Cold War, these devices have evolved from simple aircraft-delivered bombs into complex strategic arsenals, fundamentally altering global security and the logic of international military strategy ever since.

The development of nuclear weapons relies on the release of energy through fission, fusion, or both. Fission weapons, or atomic bombs, split atoms, while fusion weapons, known as hydrogen or thermonuclear bombs, release energy through the fusion process. The destructive scale of these weapons is measured in kilotons or megatons, representing the equivalent weight of conventional TNT. The 1945 Hiroshima bomb, using roughly 64 kilograms of enriched uranium, produced an explosion of approximately 15 kilotons, creating shock waves, intense heat, and lethal radiation.

Following the Second World War, the Cold War between the United States and the Soviet Union drove a massive expansion in nuclear capabilities. The U.S. stockpile peaked in 1966 with over 32,000 warheads across 30 types. By 2010, this had been reduced to about 9,400 warheads, with roughly 2,468 considered operational. The Soviet Union reached its own peak in 1988 with about 33,000 operational warheads, though by 2010, Russia’s serviceable stockpile was estimated at 4,600 warheads.

Modern nuclear strategy involves a complex array of delivery systems, including ballistic missiles launched from submarines, such as the U.S. Navy's Ohio-class vessels. Other nations have also adjusted their arsenals; Britain consolidated its force to 225 warheads by 2010, while France reduced its count to 300. Meanwhile, China’s stockpile grew to approximately 240 warheads by 2010. Concerns persist regarding the security of these materials and the safety of remaining warheads, leading to various arms control treaties like the 1963 Nuclear Test-Ban Treaty.

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