Related Rule
Practice Relating to Rule 55. Access for Humanitarian Relief to Civilians in Need
Spain’s LOAC Manual (2007) states under the heading “Passage of relief convoys to areas with civilians”:
The free passage of consignments of medical equipment and supplies is subject to the following conditions:
- they are for the exclusive use of the civilian population;
- their distribution can be effectively controlled;
- they do not give the enemy a military advantage. 
Spain, Orientaciones. El Derecho de los Conflictos Armados, Tomo 1, Publicación OR7–004, (Edición Segunda), Mando de Adiestramiento y Doctrina, Dirección de Doctrina, Orgánica y Materiales, 2 November 2007, § 9.4.b.
Spain’s Penal Code (1995), as amended in 2010, states:
Anyone who [commits any of the following acts] during armed conflict shall be punished with three to seven years’ imprisonment:
8. Intentionally using starvation of the civilian population as a method of warfare, depriving it of indispensable supplies … including by arbitrarily impeding the provision of [humanitarian] assistance, which is carried out in conformity with the [1949] Geneva Conventions and its [1977] Additional Protocols. 
Spain, Penal Code, 1995, as amended on 23 June 2010, Article 612(8).