Should any contracting Power break or disregard its covenants under ARTICLE V, it shall thereby ipso facto commit an act of war with all the members of the League, which shall immediately subject it to a complete economic and financial boycott, including the severance of all trade or financial relations, the prohibition of all intercourse between their subjects and the subjects of the covenant-breaking State, and the prevention, so far as possible, of all financial, commercial, or personal intercourse between the subjects of the covenant-breaking State and the subjects of any other State, whether a member of the League of Nations or not.
It shall be the privilege and duty of the Executive Council of the Body of Delegates in such a case to recommend what effective military or naval force the members of the League of Nations shall severally contribute, and to advise, if it should think best, that the smaller members of the League be excused from making any contribution to the armed forces to be used against the covenant-breaking State.
The covenant-breaking State shall, after the restoration of peace, be subject to perpetual disarmament and to the regulations with regard to a peace establishment provided for new States under the terms of SUPPLEMENTARY ARTICLE IV.
If any Power shall declare war or begin hostilities, or take any hostile step short of war, against another Power before submitting the dispute involved to arbitrators or consideration by the Executive Council as herein provided, or shall declare war or begin hostilities, or take any hostile step short of war, in regard to any dispute which has been decided adversely to it by arbitrators chosen and empowered as herein provided, the Contracting Powers hereby bind themselves not only to cease all commerce and intercourse with that Power but also to unite in blockading and closing the frontiers of that Power to commerce or intercourse with any part of the world and to use any force that may be necessary to accomplish that object.
Any war or threat of war, whether immediately affecting any of the Contracting Powers or not, is hereby declared a matter of concern to the League of Nations and to all the Powers signatory hereto, and those Powers hereby reserve the right to take any action that may be deemed wise and effectual to safeguard the peace of nations.
It is hereby also declared and agreed to be the friendly right of each of the nations signatory or adherent to this Covenant to draw the attention of the Body of Delegates to any circumstances anywhere which threaten to disturb international peace or the good understanding between nations upon which peace depends.
The Delegates shall meet in the interest of peace whenever war is rumored or threatened, and also whenever the Delegate of any Power shall inform the Delegates that a meeting and conference in the interest of peace is advisable.