Un avión de la Fuerza Aérea de Estados Unidos realiza un lanzamiento de prueba de una bomba B61-12 en diciembre de 2021. Esa bomba puede alojar una cabeza nuclear para su uso en tiempos de guerra. Los Alamos National Laboratory

¿Qué países tienen armas nucleares y dónde están?

Tanto los arsenales rusos como los estadounidenses cuentan con miles de armas nucleares, situadas en diversos lugares de sus propios países y, en el caso de Estados Unidos, también en Europa.
A U.S. Air Force jet performs a test drop of a B61-12 bomb in December 2021. That bomb can contain a nuclear warhead for use in wartime. Los Alamos National Laboratory

What countries have nuclear weapons, and where are they?

Both the Russian and US arsenals boast thousands of nuclear weapons, located in various places around their own countries and, for the US, in Europe as well.
This intercontinental ballistic missile was launched as part of Russia’s test of its strategic forces in 2020. Russian Defense Ministry Press Service via AP

Would Putin use nuclear weapons? An arms control expert explains what has and hasn’t changed since the invasion of Ukraine

Russia’s invasion of Ukraine and Vladimir Putin’s nuclear threats have the world on edge, but so far, long-standing arms control measures have helped keep the situation from getting out of control.
Hundreds of nuclear weapons have been tested by the U.S. since WWII, but newer science has replaced the need for live detonations. Galerie Bilderwelt / Hulton Archive via Getty Images

A restart of nuclear testing offers little scientific value to the US and would benefit other countries

Seventy-five years after the first nuclear detonation and nearly 30 years since testing was banned, the US is considering resuming live nuclear testing.
United Nations Security Council members listen to Iranian Deputy Ambassador to the United Nations Eshagh Al-Habib, left, during a meeting on Iran’s compliance with the 2015 nuclear agreement, Dec. 12, 2018, at UN headquarters. AP Photo/Mary Altaffer

Nuclear weapons and Iran’s uranium enrichment program: 4 questions answered

Iran’s leaders are threatening to breach a 2015 agreement that froze their country’s nuclear program. What is uranium enrichment, and what would it mean for Iran’s ability to build nuclear weapons?

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