(Article 11, paragraphs 1 and 2, of the Protocol in its relation to Articles 10 and 16 of the Covenant)

According to Article 10 of the Covenant, Members of the League undertake to preserve as against external aggression the territorial integrity and existing political independence of all Members of the League. In case of aggression, the Council shall advise upon the means by which this obligation shall be fulfilled.

According to Article 16, should any Member of the League resort to war in disregard of its engagements under Articles 12, 13 or 15, all other Members of the League undertake immediately to apply economic sanctions; furthermore, it shall be the duty of the Council to recommend to the several Governments concerned what effective military, naval or air forces the Members of the League shall severally contribute to the armed forces to be used to protect the engagements of the League.

At the time when they were drafted at the Peace Conference in Paris in 1919, these articles gave rise to keen controversy as to the exact scope of the engagements entered into in these provisions, that is to say, as to the nature and extent of the obligations referred to in Article 10, the exact moment at which such obligations arose, and the legal consequences of the Council recommendations referred to in Article 16, paragraph 2. This controversy continued, as is well known, in the debates here in Geneva, where the question has been discussed in previous years.

Article 11 is intended to settle this controversy. The signatories of the present Protocol accept the obligation to apply against the aggressor the various sanctions laid down in the Covenant, as interpreted in Article 11 of the Protocol, when an act of aggression has been established and the Council has called upon the signatory States immediately to apply such sanctions (Article 10, last paragraph). Should they fail so to do, they will not be fulfilling their obligations.

The nature and extent of this obligation is clearly defined in paragraph 2 of Article 11. According to this paragraph, the reply to the question whether a signatory to the Protocol has or has not fulfilled its obligation depends on whether it has loyally and effectively co-operated in resisting the act of aggression to an extent consistent with its geographical position and its particular situation as regards armaments.

The State remains in control of its forces, and itself, and not the Council, directs them, but paragraph 2 of Article 11 gives us positive material upon which to form a judgment as to whether or not the obligation has been carried out in any concrete case. This criterion is supplied by the term: loyally and effectively.

In answering the question whether a State has or has not fulfilled its obligations in regard to sanctions, a certain elasticity in the obligations laid down in Article 11 allows of the possibility of taking into account, from every point of view, the position of each State which is a signatory to the present Protocol. The signatory States are not all in possession of equal facilities for acting when the time comes to apply the sanctions. This depends upon the geographical position and economic and social condition of the State, the nature of its population, internal institutions, etc.

Indeed, during the discussion as to the system of sanctions, certain delegations declared that their countries were in a special situation by reason of their geographical position or the state of their armaments. These countries desired to co-operate to the fullest extent of their resources in resistance to every act of aggression, but they drew attention to their special conditions. In order to take account of this situation, an addition has been made to paragraph 2 of Article 11 pointing out this state of affairs and laying stress on the particular situation of the countries in question. Moreover, Article 13 of the Protocol allows such countries to inform the Council of these matters beforehand.