The Stockholm International Peace Research Institute (SIPRI) today launches the findings of SIPRI Yearbook

2020, which assesses the current state of armaments, disarmament and international security.


A key finding is that despite an overall decrease in the number of nuclear warheads in 2019, all nuclear weapon-possessing states continue to modernize their nuclear arsenals.

Nuclear warhead reductions continue despite growing tensions

The nine nuclear-armed states—the United States, Russia, the United Kingdom, France, China, India, Pakistan, Israel and the Democratic People’s Republic of Korea (North Korea)—together possessed an estimated 13 400 nuclear weapons at the start of 2020. This marked a decrease from the 13 865 nuclear weapons that SIPRI estimated these states possessed at the beginning of 2019 (see table below). Around 3720 of the nuclear weapons are currently deployed with operational forces and nearly 1800 of these are kept in a state of high operational alert.

The decrease in the overall number of nuclear weapons in the world in 2019 was largely due to the dismantlement of retired nuclear weapons by Russia and the USA—which together still possess over 90 per cent of global nuclear weapons. The reductions in US and Russian strategic nuclear forces required by the 2010 Treaty on Measures for the Further Reduction and Limitation of Strategic Offensive Arms (New START) were completed in 2018, and in 2019 the forces of both countries remained below the limits specified by the treaty......

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