Developing client-centred marketing programmes in a fragile external environment Victoria A. Bondarenko, Olesya V. Ivanchenko, Natalia V. Guzenko and Dina E. Bekbergeneva E3S Web Conf., 403 (2023) 08001 Published online: 25 July 2023 DOI: 10.1051/e3sconf/202340308001