Role of nuclear weapons grows as geopolitical relations deteriorate—new SIPRI Yearbook out now

The nine nuclear-armed states—the United States, Russia, the United Kingdom, France, China, India, Pakistan, the Democratic People’s Republic of Korea (North Korea) and Israel—continued to modernize their nuclear arsenals and several deployed new nuclear-armed or nuclear-capable weapon systems in 2023.

Of the total global inventory of an estimated 12 121 warheads in January 2024, about9585 were in military stockpiles for potential use (see the table below). An estimated 3904 of those warheads were deployed with missiles and aircraft—60 more than in January 2023—and the rest were in central storage. Around 2100 of the deployed warheads were kept in a state of high operational alert on ballistic missiles. Nearly all of these warheads belonged to Russia or the USA, but for the first time China is believed to have some warheads on high operational alert.

‘While the global total of nuclear warheads continues to fall as cold war-era weapons are gradually dismantled, regrettably we continue to see year-on-year increases in the number of operational nuclear warheads,’ said SIPRI Director Dan Smith. ‘This trend seems likely to continue and probably accelerate in the coming years and is extremely concerning.’

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