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Draft International Convention on the Condition and Protection of Civilians of enemy nationality who are on territory belonging to or occupied by a belligerent. Tokyo, 1934.
Chapter IV#Section I: Execution of the Convention - Art. 20.
Application and Execution.
Article 20.- The provisions of the present Convention shall be respected by the High Contracting Parties in all circumstances.
In the event that, in time of war, one of the belligerents should not be a party to the Convention, its provisions shall nevertheless remain obligatory between the belligerents parties thereto.