Règle correspondante
Costa Rica
Practice Relating to Rule 15. The Principle of Precautions in Attack
In 1991, in a letter to the UN Secretary-General concerning the Gulf War, Costa Rica commended “the precautions taken by the forces of the United States of America and its allies aimed at attacking as far as possible only military targets and causing the least possible suffering to the civilian population”. 
Costa Rica, Letter dated 17 January 1991 to the UN Secretary-General, UN Doc. S/22101, 17 January 1991, p. 2.