State responsibility
Question 1:
  Why are the rules on state responsibility classified as secondary rules  of international law?  
  
Guidance:
  The question invites students to  consider the difference between primary and secondary rules of international  law. The book notes that primary rules are those that define the particular  obligations that generate responsibility if violated whereas secondary rules  determine the consequences of violating the primary rules. Since the purpose of  the rules on state responsibility is to determine what the international legal  consequences are for breaching substantive obligations within international  law, they are referred to as secondary rules in international law.
Question 2: 
  Can a state be in breach of its international obligations due to acts of  private individuals? 
Guidance:
  The question concerns the  question of state responsibility for acts of private individuals. The book  notes that it is a core element of state responsibility that wrongful conduct  can be attributed to a state and that the relevant provisions in the ILC  articles on state responsibility are based on the main rule that a state is not  responsible for acts of private individuals that cannot be attributable to a  state. Depending on the primary rule, however, a state may be in breach of its  obligations as a result of private acts. To that end the book makes reference  to the ICJ’s Tehran Hostages case  where Iran was found in breach of international law because it did not offer  the US Embassy the protection from private acts it was required to under the  Vienna Convention on Diplomatic Relations (the primary rules). It is also noted  how a more general obligation to offer protection from private acts was implied  in the Corfu Channel case. Reference  should also be made to the “due diligence” obligations contained in  international environmental law (Chapter 9) as well as the discussion of state  responsibility for acts of private individuals in human rights law (see Chapter  8).
Question 3: 
  What is the relationship between treaty law and state responsibility? 
Guidance:
  The question relates to an issue  that some students tend to conflate: the link between treaty-based obligations  and state responsibility. The book notes that it is within the international  law of treaties that one determines if a treaty is in force or not, how it  should be interpreted and if a treaty-based obligation been suspended, for  example due to invalidity. The rules on responsibility, on the other hand, deal  with the consequences of breaching a treaty obligation that is in force.
Question 4: 
  What are the conceptual differences between peremptory norms/jus cogens and erga  omnes obligations? 
Guidance:
  The question encourages students  to consider the concept of erga omnes obligations and to distinguish erga omnes from jus cogens. The concept of erga omnes relates to the question of  who may invoke a breach of international law. The concept of jus cogens, on the other hand, refers to  a set of norms that are so fundamental that no derogation is permitted, see  Art. 53 in the Vienna Convention on Treaties and the discussion in Chapter 2.  In Chapter 7, jus cogens is referred  to in the discussion of lawful countermeasures where it is noted that a state  cannot preclude the wrongfulness of any act that violates a peremptory norm/jus cogens character. Erga Omnes is also discussed under  Question 6.
Question 5: 
  Why was the 2007 Behrami decision from the European Court of Human  Rights criticized? 
Guidance:
  The question concerns the  controversial ECtHR decision in the Behrami case that is mentioned in the book in the discussion of the international  responsibility of international organizations. In the case, the European Court  of Human Rights concluded that acts by KFOR troops in Kosovo could be  attributed to the UN and not the troop-contributing NATO states because the UN  Security Council had retained ‘ultimate authority and control’ and only  delegated operational control to the states. That rationale was criticized  because it essentially allowed a state to avoid international responsibilities  for acts committed in the course of such operations. The book also notes that  the Court seems to have backtracked from its conclusions in Behrami. A reference could also be made  to the ILC’s 2011 commentary to the relevant article where it is noted that what  ought to be decisive is the element of ‘factual control’ and who directs the  forces when the relevant conduct occurs. 
Question 6:
  When may a state invoke the responsibility of another state?
Guidance:
  The question asks the students to  determine who may invoke the responsibility of another state. The book notes  the fundamental principle that it is the state that has been wronged (‘injured  state’) that is entitled to invoke the responsibility of the responsible state.  A state is considered to be an injured state if the obligation breached was  owed to it individually or to a group of states and the breach ‘specially  affects’ the state or if the obligation breached radically changes the position  of all other states to which the obligation is owed. Reference should also be  made to the concept of erga omnes mentioned in Question 4. The ILC articles specify, however, that a state does  not always have to be considered ‘injured’ to be entitled to invoke the  responsibility of another state. There are two types of erga omnes obligations. The first is erga omnes partes obligations where a non-injured state may invoke  the responsibility of another state ‘if the obligation breached is owed to a  group of States including that State, and is established for the protection of  a collective interest of the group’. The book lists a number of examples of  such erga omnes partes obligations.  The second form is that of (pure) erga  omnes obligations that was introduced in the Barcelona Traction case where the Court noted the existence of  obligations of a State “towards the international community as a whole”. Such  obligations can be invoked not only by an ‘injured’ state but by any state.
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