There is an increasing focus on nuclear weapons due to the current military conflicts in Europe and the Middle East. The world's nine nuclear-armed states are modernizing their arsenals and most deployed new weapon systems during the year 2025. The current conflicts include a nuclear Russia vs. Ukraine, a nuclear US vs. Iran, and a nuclear Israel vs. Palestine and Lebanon.
The world's nine nuclear-armed states are upgrading and expanding their arsenals, according to the Stockholm International Peace Research Institute. Russia and the US are the world's most powerful nuclear powers, with nearly 86 percent of all nuclear weapons globally. China's nuclear weapon arsenal is expanding faster than any other country's.
There are an estimated 12,187 nuclear weapons worldwide that are possessed by the nine nuclear-armed states: U.S., Russia, the U.K., France, China, India, Pakistan, North Korea, Israel, and Russia. The Stockholm International Peace Research Institute said in a new report that countries are increasingly relying on nuclear weapons as instruments of national power.
The number of deployed nuclear warheads worldwide has increased over the past year, according to SIPRI's annual report. Of the world's 12,000 nuclear warheads, as many as 2,200 were kept on high operational alert as of January this year, an increase of up to 100 from the previous year. China now has around 620 nuclear warheads and is expanding its arsenal faster than any other country. Norway has opened discussions with Paris about France’s extended nuclear deterrence initiative. Finland confirmed similar talks with Paris.
The Stockholm International Peace Research Institute (SIPRI) says the world's nuclear powers had an estimated total of 12,187 warheads, with about 9,745 of them in stockpiles for potential use. Since the end of the Cold War, old warheads have generally been dismantled more quickly than new ones have been deployed. China is expanding its nuclear arsenal faster than any other country. The United States' nuclear modernisation programme is progressing but it will be delayed due to funding issues.
Stalin’s strategic thinking fused Marxist-Leninist ideology, personal paranoia, and geopolitical realism. Stalin believed that only an overwhelming force could guarantee the survival of the Soviet state. The atomic project was organized into secret research centers, such as Arzamas-16, where scientists lived under surveillance and strict information controls.
The U.S.-Israeli war against Iran has reshaped several dimensions of the conflict. The nuclear issue has become part of that undeclared deterrence strategy. The roots of Iran’s nuclear program stretch back to the 1950s under the Shah. The United States played a leading role in the development of Iran's nuclear infrastructure in the 1970s.
World's nine nuclear-armed countries spent an additional $16.8bn on their arsenals in 2025 compared with the previous year. The United States spent an estimated $69.2bn, a rise of $12.6bn, more than all other nuclear powers combined. China was the second-biggest spender, followed by the United Kingdom, Russia and France.
There are 191 nations that are parties to the Nuclear Nonproliferation Treaty (NPT). There are only nine states with nuclear arsenals: US, UK, France, China, Russia, India, Israel, Pakistan, and North Korea. The UN Charter and the Universal Declaration of Human Rights are arguably of greater significance than the NPT.
Beijing is modernising and expanding its nuclear arsenal. China added 20 warheads to its nuclear stockpile as of January 2026, bringing the total to 620, up from 600 a year earlier. China has also expanded and diversified its nuclear weapons systems, showcasing newly developed ICBMs as well as submarine- and air-launched ballistic missiles at a military parade last year.