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Switzerland
Practice Relating to Rule 55. Access for Humanitarian Relief to Civilians in Need
Section B. Impediment of humanitarian relief
Switzerland’s Basic Military Manual (1987) states: “It is prohibited to starve the civilian population … by impeding relief actions in favour of the population in need.” 
Switzerland, Lois et coutumes de la guerre (Extrait et commentaire), Règlement 51.7/II f, Armée Suisse, 1987, Article 147(b).
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states: “Personnel of national and international Red Cross and Red Crescent organizations are protected. They must be able to perform their duties without interference.” 
Switzerland, Bases légales du comportement à l’engagement (BCE), Règlement 51.007/IVf, Swiss Army, issued based on Article 10 of the Ordinance on the Organization of the Federal Department for Defence, Civil Protection and Sports of 7 March 2003, entry into force on 1 July 2005, § 181.
Switzerland’s Military Criminal Code (1927), taking into account amendments entered into force up to 2011, states in a chapter entitled “War crimes”:
Art. 110
Articles 112–114 apply in the context of international armed conflicts, including in situations of occupation, and, if the nature of the offence does not exclude it, in the context of non-international armed conflicts.
Art. 112c
1 The penalty shall be a custodial sentence of not less than three years for any person who, in the context of an armed conflict:
c. as a method of warfare, … deprives civilians of objects indispensable to their survival or impedes relief consignments. 
Switzerland, Military Criminal Code, 1927, taking into account amendments entered into force up to 2011, Articles 110 and 112c (1)(c).
Switzerland’s Penal Code (1937), taking into account amendments entered into force up to 2011, states under the title “War crimes”:
Art. 264b
Articles 264d–264j apply in the context of international armed conflicts, including in situations of occupation, and, if the nature of the offence does not exclude it, in the context of non-international armed conflicts.
Art. 264g
1 The penalty shall be a custodial sentence of not less than three years for any person who, in the context of an armed conflict:
c. as a method of warfare … deprives civilians of objects indispensable to their survival or impedes relief consignments. 
Switzerland, Penal Code, 1937, taking into account amendments entered into force up to 2011, Articles 264b and 264g (1)(c).
In 2009, in its Report on Foreign Policy, Switzerland’s Federal Council stated:
One of the primary concerns of humanitarian law and policy is to guarantee access to victims and to provide assistance to them. However, it frequently occurs that one or several of the parties in conflict impede or prohibit access to these populations or that it is impossible to ensure the security of humanitarian actors. This was once more clearly evident in the Gaza Strip at the end of 2008 and at the beginning of 2009. Switzerland called upon all the parties to the conflict to allow rapid and unimpeded humanitarian access and to protect medical personnel, hospitals and other medical units. 
Switzerland, Federal Council, Report on Foreign Policy 2009, 2 September 2009, Section 3.3.7.3, p. 5811.
In 2010, in its Report on IHL and Current Armed Conflicts, Switzerland’s Federal Council stated:
3.1 Growing importance of non-State actors
… Humanitarian aid – despite its impartial, neutral and independent character – is thus only authorized with hesitation when it is used by insurgents. …
3.4 [Growing use of] anti-guerrilla tactics
Apart from the direct fight against insurgents, international humanitarian law also addresses other anti-guerrilla tactics. It prohibits, for example, the refusal of humanitarian assistance, thus obliging the parties to the conflict to ensure at any moment the protection of civilians against the dangers resulting from military operations. 
Switzerland, Federal Council, Report on IHL and Current Armed Conflicts, 17 September 2010, Sections 3.1 and 3.4, pp. 6 and 15.
[footnotes in original omitted]
Executive Summary