• Examining How Countries Go Nuclear — and Why Some Do Not

    In a new book, political scientist Vipin Narang argues that too often we imagine that all countries pursue nuclear weapons the way the U.S. and Soviet Union did during and after World War II — a swift race culminating in the rapid buildup of arsenals, leaving little room for intervention. But that paradigm applies to almost no other country. Recognizing how different countries choose different paths to proliferation is an essential part of arms control: Grasping how one country is pursuing nuclear weapons can help other countries constrain that pursuit.

  • The Progress of Iran’s Nuclear Weapons Program

    As of November 2021, Iran had enough enriched uranium hexafluoride (UF6) in the form of near 20 and 60 percent enriched uranium to produce enough weapon-grade uranium (WGU), taken here as 25 kilograms, for a single nuclear weapon in as little as three weeks. It could do so without using any of its stock of uranium enriched up to 5 percent as feedstock. The growth of Iran’s stocks of near 20 and 60 percent enriched uranium has dangerously reduced breakout timelines.

  • China’s Nuclear Buildup is About More Than Nukes

    U.S.-China nuclear and strategic stability will be tested in the coming year after a series of revelations in 2021 about Beijing’s nuclear program. Jacob Stokes writes that “The U.S.-China nuclear and strategic relationship has entered a new stage.” He adds: “Pursuing nuclear and strategic stability between the United States and China will likely prove harder than ever — but it is perhaps more important than ever, too.”

  • U.S.: Iran's Nuclear Breakout Time “Really Short”

    An unnamed source within the Biden administration has said that the amount of time required for Iran to develop nuclear weapons if it chooses to do so is “really short,” adding that the situation was “alarming.”

  • Iran Can Produce One Nuclear Weapon in as Little as Three Weeks

    The growth of Iran’s stocks of near 20 and 60 percent enriched uranium has dangerously reduced breakout timelines: Iran has enough enriched uranium hexafluoride (UF6) in the form of near 20 and 60 percent enriched uranium to produce enough weapon-grade uranium (WGU), taken here as 25 kilograms (kg), for a single nuclear weapon in as little as three weeks. It could do so without using any of its stock of uranium enriched up to 5 percent as feedstock.

  • China Nuclear Arsenal Growing Faster Than Previously Thought: Pentagon

    The Pentagon warns that China’s rapidly growing nuclear arsenal is expanding at a much faster pace than estimated just a year ago, while a new Chinese military modernization goal could provide Beijing with “more credible military operations in Taiwan.”

  • U.S. Iran Envoy: Tehran May Be Delaying Talks to Advance Nuclear Program

    Rob Malley, the top U.S. envoy on Iran says talks to revive the moribund the 2015 nuclear deal between Tehran and world powers are at a “critical phase,” warning that Iran may be engaging in delaying tactics to advance its nuclear program.

  • Nuclear War's Smoke Would Cause Climate Change, Threatening Global Food Supplies

    Nuclear war would cause many immediate fatalities, but smoke and soot from the resulting fires would also cause climate change lasting up to fifteen years, threatening worldwide food production and human health, according to a new study.

  • Quick Detection of Uranium Isotopes Helps Safeguard Nuclear Materials

    Researchers have developed a rapid way to measure isotopic ratios of uranium and plutonium collected on environmental swipes, which could help International Atomic Energy Agency analysts detect the presence of undeclared nuclear activities or material.

  • U.S. Has a Stockpile of 3,750 Nuclear Warheads

    The United States has disclosed the number of nuclear weapons in its arsenal for the first time since former President Donald Trump decided to keep the figures a secret. At the height of the cold war, in 1967, the U.S. nuclear stockpile reached its peak; 31,255 warheads.

  • Bolstering Speed, Flexibility of Response to Nuclear Events

    Researchers are combining basic research and development of emergent technologies, predictive capabilities, and systems assessment to revolutionize the speed and flexibility of technical nuclear forensic (TNF) response to nuclear events.

  • IAEA: Iran Denying Monitoring Access at “Indispensable” Site

    The IAEA, the UN nuclear watchdog, says Iran has not allowed international inspectors access to a centrifuge-component-manufacturing workshop as agreed under a monitoring deal reached two weeks ago.

  • Irreversible: Iran’s Nukes

    In 2018 the Trump administration withdrew from the nuclear deal with Iran, which the Obama administration had signed in 2015. David Albright and Sarah Burkhard of Institute for Science and International Security write that Iran’s nuclear capabilities now greatly exceed their status in early 2016, when the nuclear deal was implemented. Iran’s breakout time, namely the time needed to produce enough weapon-grade uranium for a single nuclear weapon or explosive device, is on order of one month, which was Iran’s breakout time in late 2014, before the nuclear deal was signed.

  • As the West Watches, Iran Enriches Uranium

    Iran may now be capable of producing enough weapons-grade uranium for a single nuclear warhead within just a month. While Iran continues to make progress enriching uranium, nuclear diplomacy seems to be stalled.

  • IAEA Monitors Allowed to Service Cameras at Sensitive Nuclear Sites

    An agreement has been reached between Iran and the IAEA to allow international inspectors to service surveillance cameras at Iran’s sensitive nuclear sites and to continue filming there. The agreement, announced Sunday, averts a diplomatic showdown this week.