Sicilianos, Linos-Alexandre Keywords: United Nations | Security Council | Charter | Use of force | International relations | Collective security | Mots clefs: Nations Unies | Conseil de sécurité | Charte | Force | Relations internationales | Sécurité collective | ABSTRACT In the introduction to his course, Linos-Alexandre Sicilianos, Associate Professor at the University of Athens, notes that the theme of the Security Council's authorization to use force lies at the centre of two contradictory trends that mark contemporary evolution of…