León Castellanos-Jankiewicz
@leoncastjan.bsky.social
international law and arms trade. working on the b sides
leoncastellanos.com
leoncastellanos.com
Pinned
🎯 New publication: As Europe prepares for war, we argue that current EU rearmament proposals could erode the rule of law. I thank my wonderful co-authors, from whom I learnt a great deal in @tmcasser.bsky.social & beyond.
🔗 Full article (open access): edseq.lexxion.eu/article/EDSE...
🔗 Full article (open access): edseq.lexxion.eu/article/EDSE...
Reposted by León Castellanos-Jankiewicz
"European Rearmament and U.S. Weapons Reliance" by León Castellanos-Jankiewicz, Senior Researcher, Asser Institute for International and European Law in The Hague @leoncastjan.bsky.social #TrumpAtOneYear www.forumarmstrade.org/trump_yearon...
January 19, 2026 at 3:20 PM
"European Rearmament and U.S. Weapons Reliance" by León Castellanos-Jankiewicz, Senior Researcher, Asser Institute for International and European Law in The Hague @leoncastjan.bsky.social #TrumpAtOneYear www.forumarmstrade.org/trump_yearon...
Reposted by León Castellanos-Jankiewicz
one year since David Lynch passed, happy friday and RIP big dawg
January 16, 2026 at 10:06 AM
one year since David Lynch passed, happy friday and RIP big dawg
"Instead of using new resources to build pathways for deeper European cooperation, consolidate demand, and reduce strategic dependencies, Europe’s decisionmakers are spending these resources in ways that reinforce fragmentation." carnegieendowment.org/research/202...
Rebalancing the Transatlantic Defense-Industrial Relationship: Regional Pragmatism in Northeastern Europe
Facing acute threats, states in Northeastern Europe are pioneering a pragmatic model of defense-industrial cooperation that offers lessons for managing transatlantic dependencies in an era of uncertai...
carnegieendowment.org
December 29, 2025 at 9:28 PM
"Instead of using new resources to build pathways for deeper European cooperation, consolidate demand, and reduce strategic dependencies, Europe’s decisionmakers are spending these resources in ways that reinforce fragmentation." carnegieendowment.org/research/202...
"Pavel Podvig, a Geneva-based expert on Russia’s nuclear forces, said he was skeptical deploying the Oreshnik would provide Moscow with any additional military or political advantages other than reassuring Belarus of its protection." www.reuters.com/world/europe...
Exclusive: Russia likely placing new hypersonic missiles at former airbase in Belarus, researchers find
Deployment of the Oreshnik would underscore the Kremlin’s growing reliance on the threat of nuclear weapons as it seeks to deter NATO members from supplying Kyiv with weapons.
www.reuters.com
December 28, 2025 at 4:49 PM
"Pavel Podvig, a Geneva-based expert on Russia’s nuclear forces, said he was skeptical deploying the Oreshnik would provide Moscow with any additional military or political advantages other than reassuring Belarus of its protection." www.reuters.com/world/europe...
Reposted by León Castellanos-Jankiewicz
📣 Call for applications!
We are currently accepting applications for the Milena Jesenská Fellowship, a three‑month residency for cultural journalists from across Europe, offering a monthly stipend, workspace, and access to the IWM community.
More info & to apply: www.iwm.at/calls/milena...
We are currently accepting applications for the Milena Jesenská Fellowship, a three‑month residency for cultural journalists from across Europe, offering a monthly stipend, workspace, and access to the IWM community.
More info & to apply: www.iwm.at/calls/milena...
December 25, 2025 at 1:45 PM
📣 Call for applications!
We are currently accepting applications for the Milena Jesenská Fellowship, a three‑month residency for cultural journalists from across Europe, offering a monthly stipend, workspace, and access to the IWM community.
More info & to apply: www.iwm.at/calls/milena...
We are currently accepting applications for the Milena Jesenská Fellowship, a three‑month residency for cultural journalists from across Europe, offering a monthly stipend, workspace, and access to the IWM community.
More info & to apply: www.iwm.at/calls/milena...
"The export ban on weapons to Israel will continue to apply, while a full permit procedure and thorough end-use inspections will remain mandatory for high-risk destinations, including countries subject to sanctions or affected by armed conflict." www.belganewsagency.eu/flemish-gove...
Flemish government relaxes arms trade rules and invests in defence innovation
The Flemish government has approved a new draft arms trade decree to facilitate the legitimate trade in military goods, civilian firearms...
www.belganewsagency.eu
December 24, 2025 at 7:40 AM
"The export ban on weapons to Israel will continue to apply, while a full permit procedure and thorough end-use inspections will remain mandatory for high-risk destinations, including countries subject to sanctions or affected by armed conflict." www.belganewsagency.eu/flemish-gove...
Reposted by León Castellanos-Jankiewicz
Happy Solstice! The shortest day of the year in the northern hemisphere. For places north of the Arctic Circle, that means that the sun does not rise all day, right?
Wrong!
There's an asymmetry between day and night,in favour of day, which is more pronounced the further you go from the poles. 1/5
Wrong!
There's an asymmetry between day and night,in favour of day, which is more pronounced the further you go from the poles. 1/5
December 21, 2025 at 5:28 PM
Happy Solstice! The shortest day of the year in the northern hemisphere. For places north of the Arctic Circle, that means that the sun does not rise all day, right?
Wrong!
There's an asymmetry between day and night,in favour of day, which is more pronounced the further you go from the poles. 1/5
Wrong!
There's an asymmetry between day and night,in favour of day, which is more pronounced the further you go from the poles. 1/5
Reposted by León Castellanos-Jankiewicz
U.S. gun policies is an international issue. Most crime guns in Canada are trafficked from the U.S. Bad actors in the gun industry enable and profit from it. We need @actiononguns. www.nytimes.com/2025/12/21/w... Excellebt reporting from @onishinyt @nytimes
As U.S. Guns Pour Into Canada, the Bodies Pile Up
www.nytimes.com
December 21, 2025 at 1:08 PM
U.S. gun policies is an international issue. Most crime guns in Canada are trafficked from the U.S. Bad actors in the gun industry enable and profit from it. We need @actiononguns. www.nytimes.com/2025/12/21/w... Excellebt reporting from @onishinyt @nytimes
How does defense tech undermine the traditional industrial base and legacy weapons manufacturers? Historian Susannah Glickman discusses this interesting proposition via @lawfaremedia.org: shows.acast.com/lawfare/epis...
Lawfare Daily: The Defense Tech Paradox, with Susannah Glickman | The Lawfare Podcast
shows.acast.com
December 21, 2025 at 2:11 PM
How does defense tech undermine the traditional industrial base and legacy weapons manufacturers? Historian Susannah Glickman discusses this interesting proposition via @lawfaremedia.org: shows.acast.com/lawfare/epis...
Reposted by León Castellanos-Jankiewicz
Europe’s push to arm Ukraine has sparked debates about its defence. Our article of the week outlines two competing visions of EU security: a state-led “war economy” and Silicon Valley-inspired disruptive tech.
By @jocelynmawdsley.bsky.social in @geopoliticsjournal.bsky.social
buff.ly/AC8otpn
By @jocelynmawdsley.bsky.social in @geopoliticsjournal.bsky.social
buff.ly/AC8otpn
December 20, 2025 at 12:01 PM
Europe’s push to arm Ukraine has sparked debates about its defence. Our article of the week outlines two competing visions of EU security: a state-led “war economy” and Silicon Valley-inspired disruptive tech.
By @jocelynmawdsley.bsky.social in @geopoliticsjournal.bsky.social
buff.ly/AC8otpn
By @jocelynmawdsley.bsky.social in @geopoliticsjournal.bsky.social
buff.ly/AC8otpn
UK joins defence exports treaty with France, Germany and Spain where parties "shall not oppose a transfer or export to a third party" aside from in "exceptional situations". This could increase the risk of downstream damage caused by UK defence products. www.gov.uk/government/p...
Agreement on Defence Export Controls
The UK has joined a defence exports treaty with France, Germany and Spain which will make it easier for UK defence businesses to export.
www.gov.uk
December 20, 2025 at 3:36 PM
UK joins defence exports treaty with France, Germany and Spain where parties "shall not oppose a transfer or export to a third party" aside from in "exceptional situations". This could increase the risk of downstream damage caused by UK defence products. www.gov.uk/government/p...
Reposted by León Castellanos-Jankiewicz
For most of history, societies drew firm lines between those who belonged and those who didn't, shaping who was protected or excluded. Beginning in the Enlightenment, European societies began expanding rights.
A recent SFI working group is examining the historical forces driving this expansion.
A recent SFI working group is examining the historical forces driving this expansion.
Understanding the historical forces driving the expansion of human rights
For most of human history, large societies have drawn clear lines between people who belong to the in-group and those who do not. These lines determine who is recognized, protected, or granted status,...
www.santafe.edu
December 19, 2025 at 5:24 PM
For most of history, societies drew firm lines between those who belonged and those who didn't, shaping who was protected or excluded. Beginning in the Enlightenment, European societies began expanding rights.
A recent SFI working group is examining the historical forces driving this expansion.
A recent SFI working group is examining the historical forces driving this expansion.
Reposted by León Castellanos-Jankiewicz
because all i’ve been capable of these days has been talking and texting with my students, and writing
www.bostonglobe.com/2025/12/17/o...
www.bostonglobe.com/2025/12/17/o...
I’m a scholar of gun violence. Not even I can process what happened at Brown. - The Boston Globe
My typical response to school shootings is to call for policy changes. But I’m afraid the task ahead is bigger than that.
www.bostonglobe.com
December 17, 2025 at 10:50 AM
because all i’ve been capable of these days has been talking and texting with my students, and writing
www.bostonglobe.com/2025/12/17/o...
www.bostonglobe.com/2025/12/17/o...
"It’s the season of peace and goodwill—unless you’re a European defense official." www.wsj.com/opinion/euro...
Opinion | Europe Wakes Itself Up on Defense
Some European leaders finally see the dangers clearly, but do voters?
www.wsj.com
December 17, 2025 at 8:21 AM
"It’s the season of peace and goodwill—unless you’re a European defense official." www.wsj.com/opinion/euro...
Reposted by León Castellanos-Jankiewicz
Now out!
"Crowdsourced War" @nyulawreview.bsky.social
We describe a revolution in war fighting that we call “Crowdsourced War.” It's putting civilians at risk around the globe. It is time to adopt new rules to protect civilians from the new risks they face.
papers.ssrn.com/sol3/papers....
"Crowdsourced War" @nyulawreview.bsky.social
We describe a revolution in war fighting that we call “Crowdsourced War.” It's putting civilians at risk around the globe. It is time to adopt new rules to protect civilians from the new risks they face.
papers.ssrn.com/sol3/papers....
December 15, 2025 at 12:42 PM
Now out!
"Crowdsourced War" @nyulawreview.bsky.social
We describe a revolution in war fighting that we call “Crowdsourced War.” It's putting civilians at risk around the globe. It is time to adopt new rules to protect civilians from the new risks they face.
papers.ssrn.com/sol3/papers....
"Crowdsourced War" @nyulawreview.bsky.social
We describe a revolution in war fighting that we call “Crowdsourced War.” It's putting civilians at risk around the globe. It is time to adopt new rules to protect civilians from the new risks they face.
papers.ssrn.com/sol3/papers....
Reposted by León Castellanos-Jankiewicz
Very happy to say that my article with @brunoomartins.bsky.social 'War economy vs European Silicon Valley? The EU's competing sociotechnical imaginaries of defence innovation and industry' has just been published in @cspjournal.bsky.social: www.tandfonline.com/doi/full/10....
War economy vs European Silicon Valley? The EU's competing sociotechnical imaginaries of defence innovation and industry
The war in Ukraine and the US administration's growing disengagement from European security have led to a paradigm shift in European defence. While contestation and negotiation about strategic prio...
www.tandfonline.com
December 12, 2025 at 8:52 AM
Very happy to say that my article with @brunoomartins.bsky.social 'War economy vs European Silicon Valley? The EU's competing sociotechnical imaginaries of defence innovation and industry' has just been published in @cspjournal.bsky.social: www.tandfonline.com/doi/full/10....
Reposted by León Castellanos-Jankiewicz
Total bids for the Commission’s SAFE loans reach nearly €190 billion
Total bids for the Commission’s SAFE loans reach nearly €190 billion
Demand surpassed the SAFE loan envelope by about €40 billion
dlvr.it
December 12, 2025 at 3:05 PM
Total bids for the Commission’s SAFE loans reach nearly €190 billion
Reposted by León Castellanos-Jankiewicz
The age of networked, technologically disrupted warfare requires new strategies, innovations and regulations
‼️"The Digital in War: From Innovation to Participation" series from @carnegieendowment.org & @forsvarshogskolan.bsky.social analyses these evolutions
🧵⏬
‼️"The Digital in War: From Innovation to Participation" series from @carnegieendowment.org & @forsvarshogskolan.bsky.social analyses these evolutions
🧵⏬
The Digital in War: From Innovation to Participation
The age of technological disruption in warfare is here. Read the complete series (PDF).
carnegieendowment.org
December 11, 2025 at 4:37 PM
The age of networked, technologically disrupted warfare requires new strategies, innovations and regulations
‼️"The Digital in War: From Innovation to Participation" series from @carnegieendowment.org & @forsvarshogskolan.bsky.social analyses these evolutions
🧵⏬
‼️"The Digital in War: From Innovation to Participation" series from @carnegieendowment.org & @forsvarshogskolan.bsky.social analyses these evolutions
🧵⏬
Reposted by León Castellanos-Jankiewicz
Russia could attack Nato within five years, says alliance chief in stark new warning
Russian could attack Nato within five years, Mark Rutte said, warning allies to start ramping up preparations "now".
Russian could attack Nato within five years, Mark Rutte said, warning allies to start ramping up preparations "now".
We must prepare for war with Russia, says Nato chief in stark new warning
Russian could attack Nato within five years, Mark Rutte said, warning allies to start ramping up preparations "now".
www.bbc.com
December 11, 2025 at 7:55 PM
Russia could attack Nato within five years, says alliance chief in stark new warning
Russian could attack Nato within five years, Mark Rutte said, warning allies to start ramping up preparations "now".
Russian could attack Nato within five years, Mark Rutte said, warning allies to start ramping up preparations "now".
🎯 New publication: As Europe prepares for war, we argue that current EU rearmament proposals could erode the rule of law. I thank my wonderful co-authors, from whom I learnt a great deal in @tmcasser.bsky.social & beyond.
🔗 Full article (open access): edseq.lexxion.eu/article/EDSE...
🔗 Full article (open access): edseq.lexxion.eu/article/EDSE...
December 1, 2025 at 9:26 AM
🎯 New publication: As Europe prepares for war, we argue that current EU rearmament proposals could erode the rule of law. I thank my wonderful co-authors, from whom I learnt a great deal in @tmcasser.bsky.social & beyond.
🔗 Full article (open access): edseq.lexxion.eu/article/EDSE...
🔗 Full article (open access): edseq.lexxion.eu/article/EDSE...
Reposted by León Castellanos-Jankiewicz
Save the date!
10 December, 16h00-17:30 CET, the online launch of our new Report on #Ukraine.
Weapons Compass: Proliferation and Control of Arms and Ammunition in Wartime Ukraine analyzes small arms proliferation and control efforts in Ukraine since the Russian full-scale invasion in February 2022
10 December, 16h00-17:30 CET, the online launch of our new Report on #Ukraine.
Weapons Compass: Proliferation and Control of Arms and Ammunition in Wartime Ukraine analyzes small arms proliferation and control efforts in Ukraine since the Russian full-scale invasion in February 2022
November 24, 2025 at 9:28 AM
Save the date!
10 December, 16h00-17:30 CET, the online launch of our new Report on #Ukraine.
Weapons Compass: Proliferation and Control of Arms and Ammunition in Wartime Ukraine analyzes small arms proliferation and control efforts in Ukraine since the Russian full-scale invasion in February 2022
10 December, 16h00-17:30 CET, the online launch of our new Report on #Ukraine.
Weapons Compass: Proliferation and Control of Arms and Ammunition in Wartime Ukraine analyzes small arms proliferation and control efforts in Ukraine since the Russian full-scale invasion in February 2022
ESG is done www.euronews.com/my-europe/20...
EU opens door to ESG labels for companies producing weapons
Despite objections from the left, the European Parliament has approved a tweak to sustainable finance benchmarks that would open it up to companies producing “controversial weapons”.
www.euronews.com
November 28, 2025 at 9:29 AM
ESG is done www.euronews.com/my-europe/20...
'"Beautiful opportunities are emerging,” CEO Joep van Beurden told FD. ' nltimes.nl/2025/11/24/d...
Dutch manufacturers expand into defense sector with €22 billion in government funding
Dutch manufacturing companies including Aalberts, Signify, and Kendrion are increasingly focusing on producing components for the defense sector, taking advantage of rising military budgets in the Net...
nltimes.nl
November 25, 2025 at 3:38 PM
'"Beautiful opportunities are emerging,” CEO Joep van Beurden told FD. ' nltimes.nl/2025/11/24/d...
"The calculations of how to build an effective fighting force are complex. Particularly when, on average, fewer than one-third of European Union citizens said they were willing to fight for their country in a war" www.nytimes.com/2025/11/24/b...
A Draft or Volunteers? Russian Threat Prompts Urgent Debate in Europe.
www.nytimes.com
November 25, 2025 at 7:40 AM
"The calculations of how to build an effective fighting force are complex. Particularly when, on average, fewer than one-third of European Union citizens said they were willing to fight for their country in a war" www.nytimes.com/2025/11/24/b...
Rainy Sunday reading Holly Case's latest: www.lrb.co.uk/the-paper/v4...
Holly Case · Thin Pink Glaze: Habsburg Legacies
We still live in the long shadow of Habsburg disintegration. In addition to the lingering legacy of 19th-century state...
www.lrb.co.uk
November 23, 2025 at 1:53 PM
Rainy Sunday reading Holly Case's latest: www.lrb.co.uk/the-paper/v4...