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Researchers warned Monday that nuclear-armed states are removing their weapons from storage and mounting them on active delivery systems.
The Stockholm International Peace Research Institute (SIPRI) said the world's nuclear powers had an estimated total of 12,187 warheads, with about 9,745 of them in stockpiles for potential use.
That was a marginal decrease compared to the year before, as since the end of the Cold War, old warheads have generally been dismantled more quickly than new ones have been deployed, resulting in a decrease in the overall number.
The more worrying news is that even though we have lower numbers of nuclear weapons, the level of nuclear dangers and nuclear risks are rising, according to SIPRI director Karim Haggag.
SIPRI also predicts that the trend of declining nuclear arms stockpiles is likely to be reversed in the coming years as the pace of dismantlement is slowing, while the deployment of new nuclear weapons is accelerating.
Haggag also listed several worrying signs, such as a breakdown in strategic arms controls such as international agreements and competition between great powers with nuclear arms.
Another worrying trend is one whereby states that have nuclear weapons are taking them out of storage and deploying them on nuclear-capable delivery systems, leading to an increase in deployed nuclear weapons, Haggag noted.
The United States and Russia together hold around 83% of the world's stockpile of nuclear arms, with more than 5,000 warheads each.
Both countries have programs to modernize their arsenals but both have also run into challenges.
The United States' nuclear modernization program is progressing but has faced planning and funding challenges that are likely to further delay and significantly increase the cost of the program, SIPRI reported.
Russia's program has also struggled with failed tests of intercontinental ballistic missiles (ICBMs) while economic sanctions and competing demands linked to the war in Ukraine also seem to have had an effect.
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China is expanding its nuclear arsenal faster than any other country.
Intensifying geopolitical competition means a very strong incentive on the part of China to increase its reliance on nuclear weapons, Haggag stated.
SIPRI estimates that China now has 620 warheads and, depending on how it decides to structure its forces, could have as many ICBMs as the United States and Russia by 2030.
But the institute noted that even if the country reaches 1,000 nuclear warheads by that time it will still only correspond to a quarter of each of the U.S. and Russian stockpiles.
In Europe, France and the U.K. kept their nuclear arsenals steady at 290 and 225 respectively but SIPRI noted that the U.K.'s stockpile is expected to grow following a 2021 review that recommended a raised ceiling.
France's President Emmanuel Macron likewise in March ordered an increase of the French stockpile.
SIPRI said that India is believed to have slightly expanded its nuclear arsenal to 190.
India's neighbor and arch-rival Pakistan's number remained stable at 170 but the country continued to accumulate fissile material, suggesting that its nuclear arsenal might expand over the coming decade.
North Korea is also continuing to fulfill its stated goal of exponentially expanding its nuclear arsenal, according to SIPRI, which estimates that North Korea has about 60 nuclear warheads.
Israel, which does not acknowledge its nuclear weapons, is also believed to be modernizing its arsenal, which SIPRI estimated was about 90 warheads at the start of the year.
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