Соответствующая норма
Italy
Practice Relating to Rule 14. Proportionality in Attack
At the CDDH, Italy stated: “As to the evaluation of the military advantage expected from an attack … that expected advantage should be seen in relation to the attack as a whole, and not in relation to each action regarded separately.” 
Italy, Statement at the CDDH, Official Records, Vol. VI, CDDH/SR.42, 27 May 1977, p. 231.
Upon ratification of the 1977 Additional Protocol I, Italy stated that the term “military advantage” as used in the proportionality test of Articles 51 and 57 of the Protocol was understood to refer to the advantage anticipated from the attack considered as a whole and not only from isolated or particular parts of the attack. 
Italy, Declarations made upon ratification of the 1977 Additional Protocol I, 27 February 1986, § 6.
Upon ratification of the 1977 Additional Protocol I, Italy declared:
In relation to Articles 51 to 58 inclusive, the Italian Government understands that military commanders and others responsible for planning, deciding upon or executing attacks necessarily have to reach decisions on the basis of their assessment of the information from all sources which is available to them at the relevant time. 
Italy, Declarations made upon ratification of the 1977 Additional Protocol I, 27 February 1986, § 5.