Direct Participation in Hostilities

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Ensuring Accountability and Remedy for Victims of Mercenarism: Colombia at an Inflection Point

In March 2026, the Colombian Parliament and then-President Petro agreed to accede to the International Convention against the Recruitment, Use, Financing and Training of Mercenaries (International Convention). With the deposit of the accession instruments, Colombia will end a multi-year gap in the Convention’s adoption and become its 39th State party. This move represents a significant political and legal inflection point for Colombia, not least because Colombia is regarded as ‘one of the main exporters of retired military personnel who operate as mercenaries,’ presenting a challenge not only to the countries in which they fight but also to the Colombian Government, armed forces and wider society.

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The Protection of Journalist Viktoriia Roshchyna under International Humanitarian Law

Viktoriia Roshchyna, a Ukrainian journalist whose reporting focused on crime, human rights and Russia’s actions in occupied Ukraine, died in Russian captivity. She was a freelance journalist, working for various independent news outlets such as Ukrainska Pravda, as well as the Ukrainian service Radio Free Europe. Viktoriia disappeared on 3 August 2023. She was captured in…

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Levée en Masse at Sea? Rethinking a Forgotten Category of IHL

One of the more unusual features of international humanitarian law is its recognition that civilians—ordinary inhabitants of a territory—may spontaneously take up arms against an invading force and still qualify as lawful combatants. This is the concept of levée en masse: an exceptional status reserved for moments of extreme urgency, before civilians have time to organise themselves into…

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Ukranian ‘IT Army’: A Cyber Levée en Masse or Civilians Directly Participating in Hostilities?

In the days following Russia’s invasion of Ukraine, Ukraine’s Deputy Prime Minister and Minister for Digital Transformation Mykhaylo Fedorov announced in a tweet the creation of an ‘IT Army’. According to reports, as many as 400, 000 people from across the world have joined. A list of targets has been published and…

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Armed Ukrainian Citizens: Direct Participation in Hostilities, Levée en Masse, or Something Else?

As Russia began its invasion of Ukraine last week, much of the focus was, rightly, on Putin’s actions under international law, and the response of the Ukrainian military.  However, at the same time, media reports were also noting the increasing involvement of Ukrainian civilians in the defence of their country.  Initial reports spoke of civilian…

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