157 Measuring the Fragmentation of the Internet: The Case of the Border Gateway Protocol (BGP) During the Ukrainian Crisis Abstract: This paper presents the results of a year-long research project conducted by GEODE (geode.science), a multidisciplinary team made up of geographers, computer scientists and area specialists. Frédérick Douzet Professor GEODE University Paris 8 Saint-Denis, France douzet@univ-paris8.fr Loqman Salamatian GEODE University Paris 8 Saint-Denis, France salamatianloqman@gmail.com Kavé Salamatian Professor GEODE University of Savoy Annecy, France kave.salamatian@gmail.com Louis Pétiniaud PhD Candidate GEODE University Paris 8 Saint-Denis, France l.petiniaud@gmail.com Kevin Limonier Associate Professor GEODE University Paris 8 Saint-Denis, France Klimonier02@univ-paris8.fr Thibaut Alchus GEODE University Paris 8 Saint-Denis, France thibaut.alchus@gmail.com 2020 12th International Conference on Cyber Confict 20/20 Vision: The Next Decade T. Jančárková, L. Lindström, M. Signoretti, I. Tolga, G. Visky (Eds.) 2020 © NATO CCDCOE Publications, Tallinn Permission to make digital or hard copies of this publication for internal use within NATO and for personal or educational use when for non-proft or non-commercial purposes is granted providing that copies bear this notice and a full citation on the frst page. Any other reproduction or transmission requires prior written permission by NATOCCD COE.