The Law on the Use of Force & The Law of Armed Conflict

25 important questions on The Law on the Use of Force & The Law of Armed Conflict

What is the The Law on the Use of Force (jus ad bellum) and where is it's legal basis?

The Law on the Use of force: when it’s legal to resort to force in the first instance (the initial use of force).
  • UN Charter
  • Customary International Law

What is the basic rule about the law on the use of force?

There is a general prohibition on the law on the use of force accompanied by a very limited number of exceptions.

What is the historical development about The Law on the Use of Force (jus ad bellum)?

→ Historical Development
  • 1919 League of Nations Covenant: put a prohibition on war, but not in an absolute way. It only put limitations, but it did not establish a general prohibition like we see in the UN-Charter.
  • 1928 Kellog Briand Pact: instrument that contained an absolute prohibition on the use of force within international relations.
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What were some complications about the Kellog Briand Pact (1928)?

But, there were some complications withins this pacts, which resulted in a limited result :
  1. The part was not part of the nation's system, it was separate.
  2. It had a limited number of state parties.
  3. It did not comply with sanctions in the case of non-compliance.

What is the Explanation of the text of art. 2(4) UN-Charter? --> 'international relations'



Explanation of the text of art. 2(4) UN-Charter:
“International Relations” = interstate use of force. So this does not conclude the states of one state within its territory against its own people.

What is the Explanation of the text of art. 2(4) UN-Charter? --> 'force'


“Force” = this prohibition captures every threat or use of armed force (from one state to another state).
There are forms of direct and indirect force:
→ Direct armed force; the use of force regulated by the regular armed forces of one state.
→ Indirect armed force; a state's use of force through other actors (like rebel groups (contras), another states,
    private individuals)

What is the explanation of the text of art. 2(4) UN-Charter? --> “Against the territorial integrity or political independence…”


“Against the territorial integrity or political independence…” = this phrase is meant to particularly grave situations in which the use of force is being used. It is not meant to limit the scope of article 2(4) (you can see that in the manner “in any other manner…”), but it is meant to make clear that the prohibition applies in other instances where there is not perhaps a threat of political independence or territorial integrity.

What are the exceptions on the use of force?

1. The right of self-defence
2.  Chapter VII Enforcement Actions UN-Charter

What are the requirements for individual self-defence?

Requirements of individual self-defence:
  1. ‘armed attack’ ( §195)
  2. Necessity & proportionality (§176)
Security Council notification ( §235) (=temporal limitation)

What is collective self-defence (Nicaragua §193, 195, 199) ?

One or more states are acting on behalf of another ‘victim’-state. (This is what USA claimed to be doing in the case of Nicaragua)

What are the requirements for collective self-defence?

Requirements of collective self-defence:
  1. Victim state entitled to exercise individual S-D
  2. Victim state declares itself to be victim (of armed attack)
  3. Victim state requests assistance

Is anticipatory self-defence a possibility?

Anticipatory self-defence
When taken a further look into art. 51 UN-charter, it seems to exclude the possibility of anticipatory self-defence (“if an armed attack occurs”).

What is Preemptive/preventive self-defence?

This is self-defence in response to attacks that are more remote, or more far away in the future. These forms of self-defence are unlawful and not in form for debate.

What is meant by forcible measures (art. 42 UN-Charter)?

= the provision that allows for forcible measures, that allows the SC to authorise UN-member states to take action (and take force). This provision refers to the use of force.
  • The SC can take such action by air, sea or land forces as may be necessary to maintain or restore international peace and security.

According to art. 48 UN-Charter, when the SC takes a decision in a resolution adopted under chapter VII, those decisions require...

compliance (=naleving) by all UN-members.  

What is The Law of Armed Conflict (jus in bello) (International Humanitarian Law/Law of War)?

= regulates the actual use of force, the conduct of hostilities. This is the body of law that mainly focuses on the protection of civilians in times of armed conflict. The manner in which a state uses force, also has to be lawful.

What is the legal basis of the law of armed conflict?

  • The sources of law are quite different from the law on the use of force: 1949 Geneva Conventions, additional protocols, other treaties, customary international law.
  • Again, treaty law and customary international law are existing parallel next to each other.


Does the Law of Armed Conflict also aply if parties of a conflict have iniatlly entered the conflict in a lawful matter?

The Law of Armed Conflict applies regardless whether parties of a conflict have initially entered the conflict in a lawful matter. So even though a state acts lawfully because of self-defence (the law on the use of force), it can still be unlawful according to the law of armed conflict. For example, this can be the case because of the use of prohibited weapons or when a state deliberately attacks civilians or civilian objects.

When does the LOAC apply for non-international Armed Conflicts?

These are internal armed conflicts that include one state and a non-state actor (Israel & Hamas)

Who can participate in hostilities? → Combatants vs Civilians. A distinction needs to be made between:

1. Lawful Combatants
2. Unlawful Combatants

What are lawful combatants?

→ Lawful Combatants
Is someone who can lawfully participate in hostilities (=vijandelijkheden). Because this person is a lawful combatant, when they get captured, they need to get the ‘prisoner of war’-status. They also can not be prosecuted for their conduct (=their participation in war) by the other side.

There are two types of lawful combatants;

Two types of lawful combatants:
  • Regular armed forces (GCIII Art 4(A)(1)): these people wear uniforms (easy to recognize).
  • Irregular, Lawful Combatants (GCIII Art 4(A)(2); see also API Art 44(3)): not part of the regular armed forces of the state. (for example; in the Ukraine there were foreign veterans that travelled to the Ukraine to fight Russia, and could be qualified as irregular, but still lawful combatants).

What are unlawful combatants?


→ Unlawful Combatant
An unlawful combatant is a civilian that participates in hostilities.
Such a civilian is not entitled to prisoner of war status,
when captured by the other side. They can indeed be
prosecuted by the other side for their participation in hostilities.

For the distinction of lawful combatants, take a look at GCIII Art. 4

In practice, this distinction is often a problem, where lawful
Combatants are not recognized as lawful combatants.

Who/what can be attacked during an armed conflict? What is a legitimate target?

--> there are two fundamental principles who help you determine this:

1. Principle of distinction
2. Principle of proportionality

Geneva Conventions Common Article 3
When do we have a non-international armed conflict? → Requirements:

  1. State and non-state actor
  2. Level of violence that surpasses certain minimum threshold (protracted armed violence)
  3. Both parties to conflict are militarily organised

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