The article argues that, by bringing a number of changes of systemic proportions in the order of international law, the internationalization of national constitutional human rights law has led to the ‘constitutionalization’ of international law. To build that argument, the paper first critically assesses the constitutionalization narrative. To that end it explains the reasons for its agnostic stance vis-à-vis the constitutionalization narrative and highlights the fact that international law has always contained some general, “constitutional” features that are particular to its systemic physiognomy. The article then explains how human rights law, as a special branch of international law, expands beyond the so-called humanization of international law narrative, acting as an important ingredient in a number of other narratives such as the constitutionalization of international law and the ones that are comparable to it, like legal pluralism and fragmentation. As to the systemic changes the internationalization of human rights has brought to the order of public international law, the examples given are those of collective enforcement at the decentralized level for the protection of common interests/values, sui generis normative hierarchy beyond jus cogens and the idea of the responsibility of states to act in a protective manner linked with the principle of due diligence and the so-called positive effect that human rights develop.

A serious issue that has confronted the international community is the legality of humanitarian intervention. Although the majority of scholars reject the existence of a doctrine of humanitarian intervention, could the attacked state invoke the responsibility of an intervening state before an international tribunal? This article attempts to answer this question in light of the often misunderstood clean hands doctrine in international law. It first concludes that under the lex lata, humanitarian intervention is prohibited under international law. This raises the question whether the clean hands doctrine may nevertheless preclude a court or tribunal from adjudicating in favour of a state that has been subject to humanitarian intervention. Although the clean hands doctrine exists under international law in various manifestations, its applicability in cases concerning humanitarian intervention is lacking. The article finally considers whether the jus cogens status of the prohibition of the use of force would prevent the applicability of the clean hands doctrine to humanitarian intervention cases were the clean hands doctrine to evolve into a customary international legal norm.