International Court of Justice (ICJ) (DP IB Global Politics: HL): Revision Note

Jane Hirons

Written by: Jane Hirons

Reviewed by: Lisa Eades

Updated on

Origins and purpose of the ICJ

  • The ICJ is an international court located in The Hague, Netherlands

    • It is the principal judicial organ of the UN

  • It is sometimes referred to by the building's old name, the Peace Palace, a building once used by the League of Nations

Historic building with a clock tower, surrounded by a manicured garden full of colourful tulips, under a clear blue sky.
The Peace Palace in The Hague, Netherlands
  • The ICJ was established in 1945 as part of the UN Charter (Article 92) 

  • Its purpose is to resolve disputes between states through:

Negotiation

Mediation

Conciliation 

  • When states involved in a dispute try to reach an agreement themselves through direct discussion

  • When a neutral third party helps states in a dispute communicate and find a solution, without imposing a decision

  • When an independent body examines a dispute and proposes a solution to the states involved; they can choose whether or not to accept

  • Although cases brought to the ICJ are not always focused specifically on human rights, the ICJ rules on whether states' actions violate international human rights laws

Interactions with state actors and the ICJ

  • The ICJ is designed to work with state actors to resolve disputes

    • It respects state sovereignty and cannot force a state into its court

    • It has the authority to criticise the actions of states deemed to be breaking international law

  • The ICJ has 15 judges each serving nine-year terms

    • Judges are elected by the UN General Assembly and Security Council

    • They come from all over the world with no duplication (member states of the UN) to ensure fairness and diversity

  • Court cases heard by the ICJ are between state actors only

    • States must have accepted a declaration recognising the ICJ’s authority

    • For a case to be brought to the ICJ, both states must give their consent

Case Study

Nicaragua v Colombia (ICJ Maritime Dispute)

This case, between Nicaragua and Colombia, ran from 2013 to 2022, with earlier rulings linked to a longer dispute over maritime boundaries

Both states accepted the ICJ’s authority, allowing the case to be heard

Reason for the case

  • The dispute centred on sovereignty over parts of the Caribbean Sea, including control of fishing areas and potential oil resources

  • Nicaragua argued that Colombia was unlawfully claiming resources within its maritime territory

Role and decision of the ICJ

  • The ICJ examined the legal arguments

  • It ruled that Colombia had violated Nicaragua’s maritime rights and ordered it to stop claiming ownership of fishing and oil resources in Nicaragua’s waters

Significance

This example highlights that the ICJ only hears cases between state actors and depends on state consent to operate

It can clarify and uphold international law, even though enforcement relies on states themselves

Strengths and limitations of the ICJ

  • The ICJ has had successes resolving disputes between states

    • The court is often called upon to condemn the actions of states breaking international law

  • State sovereignty is one of the biggest limitations of the ICJ

Strengths

Limitations

  • It can prevent conflict if states are willing to resolve differences using legal means

  • It advises UN agencies regarding legal matters

  • Seen as the global authority on international law and is called upon in times of crisis to respond 

  • Cases take a long time to resolve

  • Both states have to agree to take their dispute to the court

  • States must agree to accept the decision of the court as legally binding

  • If states ignore the decisions of the court the ICJ can’t force action and must appeal to the Security Council to get them to act

Case Study

The ICJ's response to Israel’s actions in Gaza

The International Court of Justice (ICJ) has assessed Israel’s actions in Gaza, focusing on international law and allegations of genocide. The case began in 2023 and is ongoing (as of 2026). South Africa is bringing the case, with Israel as the responding state

Judges in robes sit at a dais in the International Court of Justice, engaged in discussion, with two emblems visible on the front panel.
The ICJ sits to consider the case, brought by South Africa, of Israel's actions in Gaza

Reason for the case

  • The case was brought under the Genocide Convention, which allows disputes to go to the ICJ

  • South Africa argued that Israel had violated the Genocide Convention through its military actions in Gaza, highlighting harm to civilians and severe humanitarian conditions

Provisional decision and measures

  • In 2024, the ICJ ordered Israel to:

    • take steps to prevent possible acts of genocide

    • allow more humanitarian aid into Gaza

    • prevent incitement to genocide

  • It did not order a ceasefire but stressed the seriousness of the situation

Significance

This example shows that:

  • the ICJ can hold states accountable under international law

  • it relies on international agreements and state cooperation

  • enforcement depends on global pressure, not direct power

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Jane Hirons

Author: Jane Hirons

Expertise: Content Writer

Jane has been actively involved in all levels of educational endeavors including designing curriculum, teaching and assessment. She has extensive experience as an international classroom teacher and understands the challenges students face when it comes to revision.

Lisa Eades

Reviewer: Lisa Eades

Expertise: Business Content Creator

Lisa has taught A Level, GCSE, BTEC and IBDP Business for over 20 years and is a senior Examiner for Edexcel. Lisa has been a successful Head of Department in Kent and has offered private Business tuition to students across the UK. Lisa loves to create imaginative and accessible resources which engage learners and build their passion for the subject.