As the International Court of Justice pointed out in East Timor, the right of peoples to self-determination is one of the fundamental principles of contemporary international law. This principle, being established for the protection of a collective interest of the international community as a whole, gives rise to obligations erga omnes, i.e. obligations owed to all States. This essay aims to explore the consequences deriving from this qualification of the right of self-determination on the role and responsibilities of third States in the face of repression of peoples’ legitimate aspirations. To do this, it has been chosen to follow the generale scheme of the ILC Articles on State Responsibility, focusing on those provisions that deal with violations of collective obligations: Article 48 (which provides that «a State other than an injured State» is allowed to invoke the responsibility of an injured State if the obligation breached is due to the International Community), Article 54 (auth
Autodeterminazione dei popoli e terzi Stati / Papa, MARIA IRENE. - STAMPA. - (2014), pp. 53-85. ((Intervento presentato al convegno a prova del nuovo millennio tenutosi a Messina nel 30 maggio 2014.