Opinion Pieces

A collection of analytical articles exploring International Law sources and EU fundamental rights — written in clear, accessible language by Laure Driessen.

The European Union's legal order rests on a unique interplay between international treaties and its own autonomous sources of law. Primary legislation, including the Treaties and the Charter of Fundamental Rights, sits atop a hierarchy that gives binding force to secondary legislation such as regulations and directives. Understanding this layered system is essential for grasping how EU law interacts with national legal frameworks. The Court of Justice of the European Union plays a central role in interpreting these sources, ensuring uniform application across Member States while respecting the distinct legal traditions that shape the Union's evolving constitutional identity.

Fundamental rights protection within the EU has developed significantly through the Court's jurisprudence, long before the Charter gained binding legal force. The Court recognised general principles of EU law drawing from common constitutional traditions of Member States and the European Convention on Human Rights. This dynamic approach allows fundamental rights to apply within the scope of EU law, affecting areas from free movement to citizenship rights. Landmark rulings have clarified how these protections operate in practice, balancing individual freedoms against public interest objectives while maintaining the coherence of the Union's legal framework.

International law sources continue to shape EU external relations and internal legal development. The Union's treaty-making powers, the status of international agreements within the EU legal order, and the conditions under which individuals can rely on international provisions before national courts raise complex questions. The Court's approach to reviewing the compatibility of EU acts with international law demonstrates a careful balancing act between respecting international commitments and preserving the autonomy of the EU legal system. These dynamics become particularly evident in areas such as trade, investment protection, and human rights.

Citizenship of the Union has evolved through judicial interpretation into a fundamental status carrying concrete rights. The Court has progressively defined the contours of EU citizenship, linking it to free movement rights and non-discrimination on grounds of nationality. Cases concerning family reunification, residence rights, and the loss of citizenship have tested the boundaries of Member State sovereignty against Union citizenship protections. These developments illustrate how the interplay between national competence and EU law continues to reshape the relationship between individuals and the legal frameworks that govern their lives across Europe.