Marco Roscini

Professor of International Law, University of Westminster - Senior Fellow, NATO CCDCOE. IHL, use of force, cyber warfare, nuclear weapons, history of IL.

[Marco Roscini @marcoroscini]

Legum servi sumus ut liberi esse possimus

[Marco Roscini @marcoroscini]

I was interviewed on the agreement between the US and Iran and its potential implications for navigation through the Strait of #Hormuz #InternationalLaw (in Italian) https://t.co/WgITTqtXrP

[International Law at Westminster @ILaWWestminster]

Looking to advance your expertise in international law? Join our LLM in International Law in the heart of London. September or January start. Full-time or part-time. #InternationalLaw #LLM #StudyInLondon https://t.co/IXP6dqS9sv

[Marco Roscini @marcoroscini]

Excited to be at CyCon 2026 in beautiful and sunny Tallinn this week, presenting on AI and the duty to respect and ensure respect for international humanitarian law and moderating a panel on attribution #cycon2026 @ccdcoe

[United Nations @UN]

Even wars have rules.

The Geneva Conventions protect civilians in conflict and help ensure assistance reaches those in need, without discrimination.

https://t.co/Jh9e5nxBVl

[Enrico Letta @EnricoLetta]

I never thought I’d hear it in my life.

[Marco Roscini @marcoroscini]

Looking forward to contributing to the discussion on #CyberOperations and #neutrality ⁦@GVAGrad⁩ conference on “Neutrality in Cyberspace: International Humanitarian Law at the Digital Battlefield” https://t.co/V87cs5cevf

[Reuters @Reuters]

Spain has closed its airspace to US planes involved in attacks on Iran, a step beyond its previous denial of use of jointly-operated military bases https://t.co/cMTBq6X4x6

[Marco Roscini @marcoroscini]

I was interviewed by @AFP on the “Tehran Toll Booth” and what it means for navigation, security, and international law in the Strait of #Hormuz : Détroit d'Ormuz: le passage "sûr" proposé par l'Iran est-il juridiquement valable? https://t.co/tzZEtiZSXa

[Mark Kersten || @markkersten.bsky.social @MarkKersten]

Slovenia was keen to join South Africa's case over Israel's alleged genocide in Gaza at the #ICJ but decided against it due to "security risks", as national security officials stressed that many of the country's cyber defence systems are of Israeli origin: https://t.co/axrtwVtxVF

[Marco Roscini @marcoroscini]

It was great to come and discuss cyber operations and international law with the participants, thank you for the invitation! @UKOSCE

[Alena Kupchyna @AlenaKupchyna]

Glad to open TNTD workshop on the applicability of intl. law in cyberspace, where experts unpacked complex legal challenges surrounding state use of ICTs & explored how national positions can help clarify & strengthen responsible state behaviour in cyberspace. @UKOSCE #cyberCBMs

[Dr Juliette McIntyre @juliettemm]

You mean that international law which has a warrant out for Putin's arrest?

[Pedro Sánchez @sanchezcastejon]

The world, Europe, and Spain have faced this critical moment before. In 2003, a few irresponsible leaders dragged us into an illegal war in the Middle East that brought nothing but insecurity and pain.

Our response then must be our response now:

NO to violations of international law.

NO to the illusion that we can solve the world’s problems with bombs.

NO to repeating the mistakes of the past.

NO TO WAR.
https://t.co/KpRjBfwY4B

[Pedro Sánchez @sanchezcastejon]

Rechazamos la acción militar unilateral de EE.UU. e Israel, que supone una escalada y contribuye a un orden internacional más incierto y hostil.

Rechazamos igualmente las acciones del régimen iraní y de la Guardia Revolucionaria. No podemos permitirnos otra guerra prolongada y devastadora en Oriente Medio.

Exigimos la desescalada inmediata y el pleno respeto del derecho internacional.

Es hora de retomar el diálogo y alcanzar una solución política duradera para la región.

[Marco Roscini @marcoroscini]

What is a ‘threat’ of force under Art. 2(4) UN Charter? My answer is in an article I published almost ten years ago in the Netherlands International Law Review: https://t.co/XBGxwn61Vu #iran #greenland #trump #internationallaw #gunboatdiplomacy https://t.co/ehnHCRqVsm

[Barack Obama @BarackObama]

If Congress doesn’t act, the last nuclear arms control treaty between the U.S. and Russia will expire. It would pointlessly wipe out decades of diplomacy, and could spark another arms race that makes the world less safe. This piece is worth the read. https://t.co/NPtKyjYRml

[Marco Roscini @marcoroscini]

A reminder of this event at ⁦@ILaWWestminster :⁩ Rethinking Collective Self-Defence in International Law, 3 February, 6 pm https://t.co/qWjPfwchpU

[Marco Roscini @marcoroscini]

If you want to know whether Trump’s tariff threats are a violation of the principle of non-intervention, Chapter 3 of my book might be of interest. It explores what coercion is and whether economic coercion is unlawful under customary int’l law https://t.co/isYekzqNmM

[Marco Roscini @marcoroscini]

@arredondos @UW_WLS @ILaWWestminster Sadly it is, sorry!

[Marco Roscini @marcoroscini]

Join James Green and myself for ‘Rethinking Collective Self-Defence in International Law’ on 3 February @UW_WLS With global debate raging over threats to Greenland, this discussion couldn’t be more relevant #InternationalLaw ⁦@ILaWWestminster⁩ https://t.co/inCre0ITJ1

[BBC News (World) @BBCWorld]

We choose Denmark over US, Greenland's PM says https://t.co/GzzWkr5uzf