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Chatham House Law @CHIntLaw

The International Law Programme at @ChathamHouse conducts policy-oriented research on critical issues of public international law.

Joined July 2014
  • Tweets 1,115
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  • Followers 5,607
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Chatham House Law@CHIntLaw
Apr 28
šŸ“¢Join us on Thursday 11 June to celebrate the launch of our upcoming paper 'Medical care in armed conflict: addressing the crisis'. Thursday 11 June, 17:00-18:15 BST Register below ā¤µļø chathamhouse.org/events/all/ā€¦

Targeting medics on the battlefield: addressing the crisis through law and practice

Experts clarify international humanitarian law and promote compliance by identifying practical measures for its effective implementation.

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šŸ—³ļøWho will be the next UN Secretary-General? We'll be joined by two of the candidates, Rafael Mariano Grossi and Rebeca Grynspan, to present their vision of how they might lead the organization. Friday 29 May 11:00 - 13:00 BST Register belowā¤µļø chathamhouse.org/events/all/ā€¦

Who will be the next UN Secretary-General? Rafael Mariano Grossi and Rebeca Grynspan each present...

Two of the candidates to be the next United Nations Secretary-General come to Chatham House to discuss how they might lead the organization, and what the role will require during a period of geopol...

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šŸ“A US Department of War memo reignited debate over ownership ā€“ which is complicated by Argentine independence, British administration, and the principle of self-determination. Read the full explainer belowā¤µļø chathamhouse.org/2026/05/whoā€¦

Who owns the Falkland Islands?

A US Department of War memo reignited debate over ownership ā€“ which is complicated by Argentine independence, British administration, and the principle of self-determination.

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šŸš¢Freedom of passage through the Strait is a key issue for all maritime nations, writes Professor Marc Weller, Director of the International Law Programme at Chatham House. Read the full explainer below ā¤µļø chathamhouse.org/2026/04/strā€¦

The Strait of Hormuz, shipping, and law

Freedom of passage through the Strait is a key issue for all maritime nations, writes Professor Marc Weller, Director of the International Law Programme at Chatham House.

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Chatham House Law retweeted
Chatham House International Security@CH_IntSecurity
Mar 27
šŸ–ŠļøThe latest research paper from @HarrietMoynihan @JoyceHakmeh & @NayanaPrakash1 discusses the role of Russian cyber proxies against Ukraine and its allies and considers how international and domestic law can hold proxies to accountšŸŒ Click for moreā¬‡ļø chathamhouse.org/2026/03/holā€¦

Holding state-sponsored hackers and other cyber proxies to account

In Russiaā€™s war against Ukraine, non-state actors of varying closeness to the Russian government ā€“ from apparent GRU contractors to cybercriminals to independent hacktivists ā€“ have launched cyberat...

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"The UK has taken a step closer to involvement in the US and Israeli war against Iran" šŸ“Read more from Professor Marc Weller, International Law Programme Director chathamhouse.org/2026/03/uk-ā€¦

UK arguments for US operations from its bases blur the line between lawful self-defence and...

The UK claims any US aircraft flying from bases like Fairford and Diego Garcia can only act in defence of British regional allies. Such a distinction may be unrealistic in a theatre of war.

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Chatham House Law retweeted
Chatham House
@ChathamHouse
Mar 5
"There's no ready legal basis that can be invoked in order to justify the present operation" Professor Marc Weller (@CHIntLaw) on the legal basis for the US and Israel's military campaign against Iran.
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US-Israeli air strikes ā€“ and the assassination of Supreme Leader Khamenei ā€“ create precedents for other countries seeking to resort to force without consideration for the rule of law. Read more from Professor Marc Weller below ā¤µļø chathamhouse.org/2026/03/iraā€¦

With Iran attacks, President Trump is making the use of force the new normal ā€“ and casting aside...

The attacks ā€“ and the assassination of Supreme Leader Khamenei ā€“ create precedents for other countries seeking to resort to force without consideration for the rule of law.

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Earlier this month Marc Weller, Director of the International Law programme, gave evidence to the UK House of Lords International Relations and Defence Committee on the legality of US actions in Venezuela. šŸ“ŗWatch the full committee session here: parliamentlive.tv/event/indeā€¦
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"Objections to ratification are based on the language of a 1966 USā€“UK agreement. But these objections misread that treatyā€™s intent and context." Read more from our Programme Director, Marc Weller, here:ā¤µļø chathamhouse.org/2026/01/uk-ā€¦

UK ratification of the Chagos Archipelago treaty will not violate international law

Objections to ratification are based on the language of a 1966 USā€“UK agreement. But these objections misread that treatyā€™s intent and context.

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Chatham House Law retweeted
Int'l Criminal Court
@IntlCrimCourt
Feb 6
Following the launch of the #ICC Office of the Prosecutor's Policy on Cyber-enabled Crimes in December, Special Adviser Marko Milanović spoke at @ChathamHouse in London this week on prosecuting cyber-enabled international crimes.
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Greenland is an island with the right to independence, which may store up legal problems ā€“ as the UKā€™s experience with the Chagos Archipelago shows. Read more from Marc Weller hereā¤µļø chathamhouse.org/2026/01/if-ā€¦

If Trumpā€™s ā€˜frameworkā€™ Greenland agreement relies on creating ā€˜sovereignā€™ bases, it would bring...

Greenland is an island with the right to independence, which may store up legal problems ā€“ as the UKā€™s experience with the Chagos Archipelago shows.

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šŸ“¢Our latest paper, 'Securing justice for cyber-enabled international crimes is out! Join us next Wednesday 4 February to celebrate the launch of this research paper at our panel event - register via our website chathamhouse.org/2026/01/secā€¦

Securing justice for cyber-enabled international crimes | 05Ā Conclusion and recommendations

Legal foundations and practical routes to prosecution

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Non-superpower countries know that adherence to international law is not idealism, but the foundation of stable relations - and that it will only become more important in a rapidly changing world. Read our latest expert comment here: chathamhouse.org/2026/01/preā€¦

President Trump may disregard international law ā€“ but other countries want to make use of it

Non-superpower countries know that adherence to international law is not idealism, but the foundation of stable relations - and that it will only become more important in a rapidly changing world.

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šŸ“¢Join our panel of experts examining pathways to accountability and the legal frameworks needed to secure justice for cyber-enabled international crimes. Wednesday 4 February 2026, 17:30 ā€“ 19:00 GMT @ChathamHouse and online Register hereā¤µļø chathamhouse.org/events/all/ā€¦

Prosecuting cyber-enabled international crimes: What solutions are available?

Following the launch of the International Law Programmeā€™s research paper, ā€˜Securing justice for cyber-enabled international crimesā€™, experts examine pathways to accountability and the legal framewo...

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šŸ“¢ @TheWorldToday, the @ChathamHouse magazine, has launched its new issue! Stories include how Europe can save NATO, threats to LGBT rights, reinventing foreign aid and more! Read now > chathamhouse.org/publicationā€¦

Summer 2025: NATO is under threat ā€“ can it be saved?

How to secure the alliance against US doubts and Russiaā€™s aggression

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šŸ“¢Exciting new opportunity to join the Global Governance and Security Centre! We're seeking a Senior Research Fellow in international law and governance to lead and advance our work in this area. Applications close 8th June 23:59 BSTā¬‡ļø careers.chathamhouse.org/jobā€¦
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Chatham House Law retweeted
CH Russia Eurasia@CHRussiaEurasia
22 Oct 2024
New event | Addressing Russiaā€™s use of forced displacement in Ukraine | 7 Nov, 12:30GMT | at @ChathamHouse & online Speakers: @aarif_abraham, @HelenaKennedyKC, @Sarahlikesfilms, @KateRashevska, Maria Logan Moderator: Rashmin Sagoo (@CHIntLaw) RegisteršŸ‘‡ chathamhouse.org/events/all/ā€¦

Addressing Russiaā€™s use of forced displacement in Ukraine

Experts consider the role international law could play in responding to Russiaā€™s forcible movement of people during its war against Ukraine.

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"The ICJā€™s approach so far suggests the best defence in court may be a policy of strict scrutiny to avoid exported arms being used to violate international humanitarian law". Read @alexwentker's expert comment for @CHIntLaw here: chathamhouse.org/2024/09/morā€¦ #ICJ

More and more cases on war and genocide are being litigated at the ICJ

States providing military assistance should take note.

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Today @CHIntLaw, @OEA_Cyber, @OEA_CICTE, @OEA_BR & @Itamaraty_EN hosted a dialogue on int law in #cyberspace, in Brazil. This event helped to raise general awareness of the national position on int law in cyberspace, incl. discussion on the Cyber CBMs agreed among OAS members.
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