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Convention (XIII) concerning the Rights and Duties of Neutral Powers in Naval War. The Hague, 18 October 1907.
Art. 9. A neutral Power must apply impartially to the two belligerents the conditions, restrictions, or prohibitions made by it in regard to the admission into its ports, roadsteads, or territorial waters, of belligerent war-ships or of their prizes.
Nevertheless, a neutral Power may forbid a belligerent vessel which has failed to conform to the orders and regulations made by it, or which has violated neutrality, to enter its ports or roadsteads.