International Law and Domestic Law

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…

In August 2022, I co-authored a post on the English case of Al-Masarir v. Saudi Arabia [2022] EWHC 2199, where Knowles J held that Saudi Arabia had no immunity under Section 5 of the UK State Immunity Act 1978 (‘UK SIA’) for its use of Pegasus spyware to hack the devices of Mr Al-Masarir,…

At various points in recent months, proposals have been made to create a “free economic zone” in parts of Ukraine’s territory. These proposals seem to pursue at least two different purposes. First, they can be understood as an alternative solution to questions of a territorial nature, i.e. creating a territorial arrangement which involves neither full Ukrainian sovereignty over…

While peace still appears remote, the prospect of a negotiated end to the war in Ukraine raises difficult questions concerning the international law governing inter-state peace treaties. The unlawfulness of Russia’s use of force and the peace plans proposed to date point to issues of validity, particularly under Articles 46, 52 and 53 of the Vienna Convention…