Соответствующая норма
Practice Relating to Rule 22. The Principle of Precautions against the Effects of Attacks
Section B. Feasibility of precautions against the effects of attacks
At the CDDH, Cameroon considered that the obligations under Article 58 of the 1977 Additional Protocol I “are not absolute, since they are to be fulfilled only ‘to the maximum extent feasible’, for no one is obliged to do the impossible”. 
Cameroon, Statement at the CDDH, Official Records, Vol. VI, CDDH/SR.42, 27 May 1977, p. 239.