Related Rule
Practice Relating to Rule 140. The Principle of Reciprocity
Ecuador’s Naval Manual (1989) provides:
Some obligations under the law of armed conflict are reciprocal in that they are binding on the parties only so long as both sides continue to comply with them. A major violation by one side will release the other side from all further duty to abide by that obligation. The concept of reciprocity is not applicable to the rules of humanitarian law that protect the victims of armed conflict, that is, those persons protected by the 1949 Geneva Conventions. 
Ecuador, Aspectos Importantes del Derecho Internacional Marítimo que Deben Tener Presente los Comandantes de los Buques, Academia de Guerra Naval, 1989, § 6.2.4.