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Malaysia
Practice Relating to Rule 1. The Principle of Distinction between Civilians and Combatants
In 2010, during the consideration of the Status of the 1977 Additional Protocols by the Sixth Committee of the UN General Assembly, a statement of the delegation of Malaysia was summarized by the Committee in its records as follows:
8. [The delegate of Malaysia] said that …
10. … [t]he laws of naval warfare incorporated the fundamental principles of international humanitarian law, including necessity and proportionality …
11. [In the case of the attacks by the Israel Defense Forces on the Mavi Marmara and five accompanying vessels in May 2010] … [n]aval forces were … under an obligation to distinguish between civilians and combatants. 
Malaysia, Statement by the delegation of Malaysia before the Sixth Committee of the UN General Assembly on the Status of the Protocols Additional to the Geneva Conventions of 1949 and relating to the protection of victims of armed conflict, 18 October 2010, as published in the summary record of the 13th meeting, 8 December 2010, UN Doc. A/C.6/65/SR.13, §§ 8, 10 and 11.
Malaysia’s Armed Forces Act (1972) defines the “enemy” as “all persons engaged in armed operations against any of His Majesty’s armed forces or any force co-operating therewith and also includes armed mutineers, armed rebels, armed rioters and pirates”. 
Malaysia, Armed Forces Act, 1972, Part I, Section 2.
The Report on the Practice of Malaysia states that attacks should only be “directed against combatant targets which shall be distinguished and confirmed”. 
Report on the Practice of Malaysia, 1997, Answers to additional questions on Chapter 1.4.
In 2010, during the consideration of the Status of the 1977 Additional Protocols by the Sixth Committee of the UN General Assembly, a statement of the delegation of Malaysia was summarized by the Committee in its records as follows:
8. [The delegate of Malaysia] said that …
10. … [t]he laws of naval warfare incorporated the fundamental principles of international humanitarian law, including necessity and proportionality …
11. [In the case of the attacks by the Israel Defense Forces on the Mavi Marmara and five accompanying vessels in May 2010] … [n]aval forces were … under an obligation to … limit attacks to military objectives. 
Malaysia, Statement by the delegation of Malaysia before the Sixth Committee of the UN General Assembly on the Status of the Protocols Additional to the Geneva Conventions of 1949 and relating to the protection of victims of armed conflict, 18 October 2010, as published in the summary record of the 13th meeting, 8 December 2010, UN Doc. A/C.6/65/SR.13, §§ 8, 10 and 11.
On the basis of interviews with members of the Malaysian armed forces and the Ministry of Home Affairs, the Report on the Practice of Malaysia notes that during the communist insurgency, the security forces were barred from directly attacking civilians. 
Report on the Practice of Malaysia, 1997, Interviews with members of the Malaysian armed forces and Ministry of Home Affairs, Chapter 1.4.