Skip to main contentSkip to navigationSkip to navigation Print subscriptions Search jobs Europe edition Australia edition International edition The Guardian - Back to homeThe Guardian Show moreHide expanded menu View all News Climate crisis Environment Global development View all Opinion The Guardian view Opinion videos View all Sport Rugby union View all Culture Art & design View all Lifestyle Health & fitness Home & garden Search input google-search Print subscriptions Search jobs Digital Archive Guardian Licensing The Guardian app Newsletters Today's paper Inside the Guardian Guardian Weekly Corrections Search input google-search Search jobs Digital Archive Guardian Licensing Climate crisis Environment Global development Which countries have nuclear weapons – and are they likely to use them? – video Nuclear weapons are front of mind after the US struck a number of Iran's alleged nuclear weapons sites. How many countries have nuclear weapons? Which countries are capable of building nuclear weapons?What is the non-proliferation treaty? And why are some countries allowed to have nuclear weapons and not others?Guardian Australia's Matilda Boseley explains Matilda Boseley Sanjana Jose Lisa Favazzo Shelley Hepworth Michael Kalenderian, Source: The Guardian | As creditedWed 25 Jun 2025 07.32 CESTLast modified on Wed 25 Jun 2025 07.33 CEST Explore more on these topics Donald Trump Nuclear weapons Most viewed Most viewed Climate crisis Environment Global development Original reporting and incisive analysis, direct from the Guardian every morningSign up for our email Complaints & corrections Work for us Privacy policy Cookie policy Terms & conditions All writers Digital newspaper archive Tax strategy Newsletters Advertise with us Search UK jobs Back to top © 2025 Guardian News & Media Limited or its affiliated companies. All rights reserved. (dcr)