Related Rule
Practice Relating to Rule 53. Starvation as a Method of Warfare
Section C. Blockades and embargoes that cause starvation
Ecuador’s Naval Manual (1989) states: “Neutral vessels and aircraft engaged in the carriage of qualifying relief supplies for the civilian population … should be authorized to pass through the blockade cordon.” 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 7.7.3.