The Council of the European Union has added six Russian nationals to its sanctions list for their involvement in the development of epibatidine, a potent toxin identified as the probable cause of Alexei Navalny’s death in a Russian penal colony in 2024. The restrictive measures, announced on Monday, target four researchers from the Signal Scientific Centre — laboratory head Igor Babkin and senior scientists Sergei Galan, Olga Yudina, and Alexei Aksenov — as well as Irina Derevyagina, a chemical analyst at the State Research Institute of Organic Chemistry and Technology (GosNIIOKhT), and Colonel Mikhail Gutsalyuk, a department head at the Military Academy of Radiological, Chemical and Biological Defence. Those listed are now subject to an EU-wide asset freeze and travel ban, and EU operators are prohibited from making funds or economic resources available to them.

According to the EU Council, the Signal Centre researchers conducted studies and published articles on the synthesis of epibatidine, thereby participating in its development as a chemical weapon. The designation notice states that GosNIIOKhT, where Derevyagina works, plays a central role in Russia’s chemical weapons programme. The sanctions were adopted under the EU’s dedicated regime targeting the proliferation and use of chemical weapons, which now applies to 31 individuals and six entities. The decision follows independent analyses by several European governments — including Britain, Sweden, France, Germany, and the Netherlands — which concluded in February 2026 that epibatidine, a toxin derived from a tropical frog, was present in samples taken from Navalny’s remains and was the likely cause of his death.

Viewed from Moscow, the sanctions are an unfounded provocation. The Russian foreign ministry has dismissed the European findings as an “information hoax,” and Russian state media have consistently denied any official involvement in the opposition figure’s death. The six individuals named by Brussels have not publicly responded to the designations, and the Russian government has not acknowledged the epibatidine findings. The sanctions add a new layer of tension to already severely strained EU-Russia relations, which have been shaped by the war in Ukraine and a series of restrictive measures against Russian officials and entities since 2014.

Navalny died in February 2024 while serving a prison sentence in the Yamalo-Nenets region on charges widely viewed in Western capitals as politically motivated. His death triggered international condemnation and a new round of sanctions against Russian officials, but the precise cause remained disputed until the European governments’ joint announcement two years later. The epibatidine finding, based on forensic samples obtained by the dissident’s family and examined in multiple European laboratories, provided the first detailed toxicological explanation. The EU’s latest designations signal a continued willingness to use its chemical weapons sanctions framework to target individuals linked to the case, even as broader diplomatic channels with Moscow remain frozen.

With the new listings now in force, the focus in Brussels is expected to shift to implementation and potential follow-up designations. The EU’s chemical weapons sanctions regime allows for the addition of further individuals and entities, and European officials have previously indicated that the investigation into the circumstances of Navalny’s death remains open. No further restrictive measures have been announced, but the bloc’s foreign ministers are due to discuss the sanctions’ effectiveness at their next regular meeting.