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New Zealand
Practice Relating to Rule 53. Starvation as a Method of Warfare
Section C. Blockades and embargoes that cause starvation
New Zealand’s Military Manual (1992) states that blockade is not prohibited “even if it causes some collateral deprivation to the civilian population, so long as starvation is not the specific purpose”. 
New Zealand, Interim Law of Armed Conflict Manual, DM 112, New Zealand Defence Force, Headquarters, Directorate of Legal Services, Wellington, November 1992, § 504(2), footnote 9.