As soon as the Council has called upon the signatory States to apply sanctions, as provided in the last paragraph of Article 10 of the present Protocol, the obligations of the said States, in regard to the sanctions of all kinds mentioned in paragraphs 1 and 2 of Article 16 of the Covenant, will immediately become operative in order that such sanctions may forthwith be employed against the aggressor. Those obligations shall be interpreted as obliging each of the signatory States to co-operate loyally and effectively in support of the Covenant of the League of Nations, and in resistance to any act of aggression, in the degree which its geographical position and its particular situation as regards armaments allow. In accordance with paragraph 3 of Article 16 of the Covenant the signatory States give a joint and several undertaking to come to the assistance of the State attacked or threatened, and to give each other mutual support by means of facilities and reciprocal exchanges as regards the provision of raw materials and supplies of every kind, openings of credits, transport and transit, and for this purpose to take all measures in their power to preserve the safety of communications by land and by sea of the attacked or threatened State. If both parties to the dispute are aggressors within the meaning of Article 10, the economic and financial sanctions shall be applied to both of them. ARTICLE 12. In view of the complexity of the conditions in which the Council may be called upon to exercise the functions mentioned in Article 11 of the present Protocol concerning economic and financial sanctions, and in order to determine more exactly the guarantees afforded by the present Protocol to the signatory States, the Council shall forthwith invite the economic and financial organisations of the League of Nations to consider and report {148} soumettre un rapport sur la nature des dispositions à prendre pour mettre en vigueur les sanctions et mesures de coopération économique et financière, visées à l'article 16 du Pacte et à l'article 11 du present Protocole. En possession de ces informations, le Conseil établira par ses organismes compétents: 1. les plans d'action destinés à faire jouer les sanctions economiques et financières contre un Etat agresseur; 2. les plans de coopération économique et financière entre un Etat attaqué et les divers Etats lui portant assistance, et il communiquera ces plans aux Membres de la Société et aux autres Etats signataires. ARTICLE 13. Eu égard aux sanctions militaires, navales et aériennes dont l'application éventuelle est prévue à l'article 16 du Pacte et à l'article 11 du présent Protocole, le Conseil aura qualité pour recevoir les engagements d'Etats déterminant par avance les forces militaires, navales et aériennes que ces Etats pourraient faire intervenir immédiatement afin d'assurer l'exécution des obligations dérivant à ce sujet du Pacte et du présent Protocole.