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Convention on Maritime Neutrality. Havana, 20 February 1928.
Section III : Rights and duties of neutrals - Art. 22.
Art. 22. Neutral states are not obligated to prevent the export or transit at the expense of any one of the belligerents of arms, munitions and in general of anything which may be useful to their military forces.
Transit shall be permitted when, in the event of a war between two American nations, one of the belligerents is a Mediterranean country, having no other means of supplying itself, provided the vital interests of the country through which transit is requested do not suffer by the granting thereof.