The idealist approach to international relations, also known as liberalism, emerged prominently after World War I, advocating for a world order based on cooperation, morality, and law to prevent future conflicts. It fundamentally believes in the possibility of progress and the capacity of human reason to overcome the anarchic nature of international politics. Its core tenets are rooted in the belief that human nature is inherently good and that states can achieve mutual gains through collaboration.

Various facets of the idealist approach include:

1. Moral Principles and Ethics: Idealism posits that ethical considerations and moral principles should guide state behavior in foreign policy. It emphasizes universal values like human rights, justice, and peace.
2. International Law: It advocates for the development and adherence to international law as a means to regulate state conduct, resolve disputes peacefully, and establish a framework for global order.
3. International Organizations: Idealists champion the creation and strengthening of international institutions (like the League of Nations, and later the United Nations) as forums for cooperation, collective security, and the peaceful resolution of conflicts. These organizations are seen as crucial for fostering dialogue and building trust.
4. Collective Security: A central tenet is the concept of collective security, where an attack on one state is considered an attack on all, prompting a collective response to deter aggression and maintain peace.
5. Democracy and Self-Determination: Idealists believe that democratic states are inherently more peaceful and less likely to wage war against each other (democratic peace theory). They also advocate for national self-determination, allowing peoples to choose their own governments.
6. Disarmament: Reducing military capabilities is seen as essential to decrease the likelihood of war and foster an environment of trust.

Contemporary Relevance: Despite criticisms of being utopian or naive, especially after the failures of the League of Nations, idealism retains significant contemporary relevance:

• Human Rights and Humanitarian Intervention: The emphasis on universal moral principles underpins international efforts to protect human rights, prevent genocide, and justify humanitarian interventions (e.g., Responsibility to Protect - R2P).
• Global Governance: International organizations like the UN, WTO, WHO, and ICC continue to play vital roles in addressing global challenges such as climate change, pandemics, economic crises, and promoting international law.
• Cooperation on Transnational Issues: Idealist principles drive cooperation on issues that transcend national borders, requiring collective action, such as environmental protection, counter-terrorism, and nuclear non-proliferation.
• Diplomacy and Multilateralism: The preference for diplomacy, negotiation, and multilateral engagement over unilateral force remains a cornerstone of much international policy.

While realism often dominates discussions of power politics, idealism provides a crucial normative framework and practical tools for building a more peaceful and cooperative international system, demonstrating that states can and do pursue shared interests beyond mere survival.