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Convention on Maritime Neutrality. Havana, 20 February 1928.
Section II : Duties and rights of belligerents - Art. 4.
Art. 4. Under the terms of the preceding article
, a belligerent state is forbidden:
(a) To make use of neutral waters as a base of naval operations against the enemy, or to renew or augment military supplies or the armament of its ships, or to complete the equipment of the latter;
(b) To install in neutral waters radio-telegraph stations or any other apparatus which may serve as a means of communication with its military forces, or to make use of installations of this kind it may have established before the war and which may not have been opened to the public.