FAQs

  • How many countries have nuclear weapons and how many are there?

    Nine countries - China, North Korea, France, India, Israel, Pakistan, Russia, the United Kingdom and the United States - possess a total of nearly 13,080 nuclear weapons. Russia and the United States possess roughly 90% of the world’s nuclear weapons, with over 5,500 weapons each. Learn more



  • How destructive are today’s nuclear weapons?

    The  two nuclear weapons dropped on Hiroshima and Nagasaki, had an explosive yield of the equivalent of about 15 kilotons of dynamite and 20 kilotons of dynamite respectively. In modern nuclear arsenals, those devastating weapons are considered “low-yield.” Many of the modern nuclear weapons in Russian and U.S. nuclear weapons are thermonuclear weapons and have explosive yields of the equivalent at least 100 kilotons of dynamite - and some are much higher. One 100-kiloton nuclear weapon dropped on New York City could lead to roughly 583,160 fatalities, according to NukeMap

  • What about “nuclear deterrence” theory? Do nuclear weapons help keep the peace?

    Nuclear deterrence doesn’t work. Here’s why.

    1. We aren’t rational and we can’t read minds. For nuclear deterrence to work, all stakeholders must be perceived to act “rationally” and “predictably” but we know that’s not how people work - particularly in the fog of war.  

    2. Nuclear weapons don’t keep the peace. History shows that the existence of nuclear weapons has done nothing to prevent the many terrible conflicts since 1945, including acts of aggression against countries with nuclear weapons. In reality, nuclear weapons haven’t been used due solely to good luck – which cannot be expected to last forever.

    3. Nuclear weapons make conflicts worse. The 2022 Russian invasion of Ukraine highlights how any of the 9 nuclear-armed states can threaten or use nuclear weapons to limit the capacity of other states to respond. 

    4. Nuclear deterrence makes nuclear use more likely because the threat of use of nuclear weapons must be credible, and so the nuclear armed states are always poised to launch nuclear weapons.

    5. Nuclear weapons are useless for today’s threats. Nuclear weapons are strategically useless to address the actual security threats facing nations in the 21st century, including climate change, terrorism and cyber attacks. 



  • What is the Treaty on the Prohibition of Nuclear Weapons?

    The Treaty on the Prohibition of Nuclear Weapons was adopted in July 2017 at the United Nations with 122 countries voting in favor. It bans the use, threat of use, development, production, manufacture, acquisition, possession, stockpiling, transfer, stationing, deployment or installation of nuclear weapons, as well as assistance with, encouragement or inducement of any of these prohibited activities. The treaty also includes positive obligations requiring states parties with people or places harmed by nuclear weapons use or testing under their  jurisdiction to provide assistance and requires all states parties in a position to do so to also help these efforts. The treaty strengthens the norm against nuclear weapons as the first legal instrument to ban them.

  • Why does this treaty matter if none of the countries with nuclear weapons have joined?

    The Treaty on the Prohibition of Nuclear Weapons is a powerful normative tool to demonstrate that nuclear weapons are morally unacceptable. It strengthens the legal framework and legal stigma against nuclear weapons. The TPNW can put external pressure on nuclear-armed states to make further efforts on disarmament. 

    The TPNW  reinforces other disarmament efforts by nuclear-armed states, such as the ratification of the Comprehensive Test Ban Treaty, further reductions of arsenals, and de-alerting nuclear weapons systems. The TPNW does not preclude or prevent bilateral or multilateral agreements to reduce numbers of warheads between nuclear-armed states.

  • Why should one country give up its nuclear weapons if other countries still have them?

    Nuclear weapons pose unacceptable risks to humanity and the environment. The vast majority of the world’s nations have already chosen to contribute to a world without nuclear weapons by rejecting ever developing, possessing or using them as members of Nuclear- Weapons-Free-Zones. The vast majority of the world’s countries already recognize that nuclear weapons make them less safe, not more secure. It is time for the nine nuclear-armed states to get on board.

  • Why should countries that don’t have nuclear weapons care about this treaty?

    The possession of nuclear weapons by some states puts the whole world at risk. Strengthening the norm against the use and possession of nuclear weapons is in the interest of all states and people.

    Beyond banning and working towards the total elimination of nuclear weapons, the Treaty on the Prohibition of Nuclear Weapons contains important positive obligations for countries to receive and provide victim assistance for impacted people and environmental remediation for places impacted by nuclear weapons use and testing. The TPNW can help to ensure that affected communities receive the assistance they need.

  • Can a NATO state join the TPNW?

    According to research by the Norwegian People’s Aid, a NATO state can join the TPNW and be in compliance with the treaty as long as “they explicitly distance themselves from specific statements or formulations in Alliance documents, particularly the Strategic Concept, which can be understood as an encouragement of the retention of nuclear weapons and their possible use.” Without doing so, the NPA report finds that NATO states would be in violation of Article 1(1)(e) of the treaty.

  • Did Ukraine give up nuclear weapons?

    When the Soviet Union broke up in 1991, there were thousands of former Soviet nuclear warheads, as well as hundreds of intercontinental ballistic missiles and bombers, left on Ukraine’s territory, which it decided to transfer to Russia. Ukraine never had an independent nuclear weapons arsenal, or control over these weapons, but agreed to remove former Soviet weapons stationed on its territory. In 1992, Ukraine signed the Lisbon Protocol and it joined the Nuclear Non-Proliferation Treaty as a non-nuclear weapon state in 1994. The transfer of all nuclear material took some time, but by 2001, all nuclear weapons had been transferred to Russia to be dismantled and all launch silos decommissioned.

    While some may ask if Russia would have invaded Ukraine if it still had Soviet nuclear weapons stationed on its territory, there is little convincing historical evidence that the possession or presence of nuclear weapons definitively prevents conflict, when many other variables may be considered, including the prohibition of the use of force under the UN Charter or even just luck. Even beyond this, it is not clear that Ukraine would have been able to take control of former Soviet nuclear weapons, technically or politically. What we do know is that the possession of nuclear weapons by Russia and the United States clearly has not prevented the threat of conflict between Russia and a U.S. ally or the potential humanitarian consequences of any conflict for civilians in the region. Read more about Ukraine and nuclear weapons.