Is the US-Saudi nuclear deal dead? Far from it. Despite Trump's insistence on Israeli normalization first, nonproliferation expert Sharon Squassoni explains in @thebulletin.org why Washington is wading straight into "nonproliferation quicksand." 👇 🧵 1/7

Climate change isn't just melting Arctic ice—it's destabilizing nuclear deterrence in the High North. In @thebulletin.org, Nikita Gryazin @nikitagryazin.bsky.social & Iren Marinova @irenmarinova.bsky.social break down why our governance systems are failing to keep up. 👇 1/6 🧵

Is the US taking a double-standard approach to nuclear enrichment? In @thebulletin.org, Logan Mintz & Matthew Sharp highlight a major tension: hardline zero-enrichment for Iran, but growing tolerance for enrichment tech among US allies. 🧵👇 1/6

Is space ready for commercial nuclear energy? The recent launch of City Labs' tritium-powered BOHR satellite marks a major milestone for commercial space—and sets an urgent precedent for orbital nuclear governance, write Isobel Porteous & Mallory Stewart of @councilonstrategicrisks.org. 1/4 🧵

The Trump admin has signed a landmark 30-year "123 agreement" with Saudi Arabia, granting US nuclear firms like Westinghouse exclusive access to the kingdom's energy program. But nonproliferation experts warn it opens a dangerous door. My take for @thebulletin.org. 👇🧵1/4

The 11th NPT Review Conference ended without a consensus outcome. It's the 3rd RevCon in a row to collapse in deadlock. Why? An unyielding impasse over Iran between Washington and Tehran. Mark Goodman @markwgoodman.bsky.social breaks down what happened for @thebulletin.org 👇 🧵(1/4)

Four months after President Macron proposed "forward deterrence" to bring France’s force de frappe closer to European security, reality is proving far more complex. In @thebulletin.org, Oliver Meier @olivermeier.bsky.social breaks down what's (and what's not) in it for France’s partners. 🧵1/6

In a future nuclear crisis, the speed of AI may leave literally zero room for human judgment. John Mecklin (@meckdevil.bsky.social) and I just published our latest dispatch from Rome for @thebulletin.org, covering a historic warning from some of the world's top minds. 👇 1/6 🧵

Nobel laureates sign the Rome Declaration on Artificial Intelligence and Nuclear War. Our coverage of this week's Global Nobel Laureates Assembly coming up in @thebulletin.org.

Is London quietly abandoning its decades-long policy of minimum nuclear deterrence? In @thebulletin.org, @cser.bsky.social director S.M. Amadae and Tom Stevenson (@tomstevenson.bsky.social) argue that the UK is pivoting toward a highly destabilizing "war-fighting" posture. 🧵 (1/)

🇨🇳 Deep dive into the latest unclassified data on China’s nuclear forces. Beijing is systematically cementing a modern nuclear triad, moving far beyond its historical minimal deterrence model. Here is what the latest open-source data tells us: 🧵1/👇

Why did Trump's implicit nuclear blackmail of Iran fail so badly? In his latest piece for @thebulletin.org, editorial fellow Jack Kennedy (@jackkennedy.ie) breaks down Trump's attempt at using the "madman theory" and why it ultimately backfired. 🧵1/

Are modern nuclear policymakers suffering from collective amnesia? In @thebulletin.org, Matthew Sharp (@msharp80.bsky.social) warns that today’s leaders are forgetting the hard-fought logic that built the global nuclear order. Let’s look at three key moments we need to revisit: 🧵

Did anyone notice that the US-Iran MOU doesn't even mention "uranium"? And more importantly, did US negotiators notice?

🧵 The expiration of New START this past February has left a dangerous 35-year legal vacuum in strategic relations. How do we restart arms control in an era of hypersonic tech, drones, and space weaponization? In a new piece for @thebulletin.org Alexey Arbatov & Konstantin Bogdanov explain. 👇

OTD in 1963, JFK delivered his iconic American University speech—arguably the greatest address on nuclear weapons by a US president. Writing for @thebulletin.org, Matthew Bunn (@matthew-bunn.bsky.social) argues its lessons on unilateral restraint are urgently needed for President Trump today. 🧵👇

France is fundamentally shifting its nuclear posture. In a major policy evolution, President Macron announced a new doctrine of "forward deterrence" (dissuasion avancée) that opens French nuclear operations to nine European allies. What does this mean for NATO? 🧵

It’s a trade domino effect: Major hubs like the US and Russia would likely see agricultural yields plummet by over 70 percent from direct hits or freezing conditions. Consequently, import-dependent nations far from the conflict would face sudden, historic famines. 3/

How would a nuclear war rewrite the global food map? Today marks the final installment of our weeklong @thebulletin.org series, “Nuclear winter: Why study it now?”. In this closing piece, Florian Ulrich Jehn looks at the terrifying reality of a collapsed food system—and how we must prepare. 👇🧵1/

Even a limited regional exchange (e.g., India-Pakistan) would have global reach. The combination of soot and organic liquids from burned cities creates a chemical cocktail that would cause severe, long-lasting stratospheric ozone depletion. 4/

"Not the most cheerful thing I've ever done." For Part 3 of my @thebulletin.org series, “Nuclear winter: Why study it now?”, I interviewed MIT climate scientist Susan Solomon on the new National Academies report on the environmental effects of nuclear war. 👇🧵

🚨 Out now in the Bulletin: The 2026 Nuclear Notebook on Russian Nuclear Weapons by Hans Kristensen, Matt Korda, Eliana Johns, and Mackenzie Knight-Boyle of the Federation of American Scientists. With New START expired, here is what open-source data tells us about Russia’s arsenal. 👇 🧵(1/)

What do dinosaurs and nuclear war have in common? For Part 2 of our @thebulletin.org series "Nuclear winter: Why study it now?", I talked with climate scientists Brian Toon & Alan Robock about their new book, Earth in Flames. Here is why their warning matters today. 👇 🧵

Trump and Xi are meeting in Beijing this week for a high-stakes summit. With New START expired and global tensions flaring, many think Beijing has the upper hand. But when it comes to nuclear stability, the US holds powerful cards. Let’s look at the hand Trump should play. 👇🧵

With the expiration of New START, the final major pillar of bilateral arms control has collapsed. We are living without enforceable nuclear constraints for the first time since the 1970s. The May issue of @thebulletin.org is out: "The Very Uncertain Future of Arms Control." 🧵 1/6

Why are we studying nuclear winter now? Against a backdrop of rising global tensions, nuclear risks are back front and center—but the landscape has completely changed since the Cold War. I'm launching a new weeklong series for the @thebulletin.org. Here is why it matters: 👇 1/ 🧵

Recent military strikes on Iran's nuclear sites don't just risk escalation—they threaten the structural integrity of the Nuclear Non-Proliferation Treaty (NPT). In a new piece, Syed Ali Zia Jaffery (@alizia1992.bsky.social) explains why ignoring Iran's NPT positions weakens the global treaty. 🧵 1/

How does China expand its nuclear arsenal while posing as a champion of disarmament? At the 2026 NPT Review Conference, Beijing is deploying a highly effective diplomatic shield: the Non-Aligned Movement (NAM). 1/6 🧵

The Trump admin has a new "Nuclear Campus" plan. With it, it wants to bundle waste disposal with advanced reactors and 50,000+ jobs to make hosting "politically untenable" sites attractive to states. Is it going to break the US nuclear waste gridlock for good? 🧵 1/6

5/ I mean, have seen one of these mass protests against nuclear weapons lately? Nope.