The Russian war against Ukraine has challenged fundamental norms such as sovereignty, non-interference and the prohibition of the use of force. It has led to diverse reactions from the international community. Only very few states sided with Russia, some states remained neutral, while the vast majority condemned the attack and supported Ukraine in its right to self-defence. Thus, although there is no legal obligation, many states display behaviour that goes beyond diplomatic support. They support Ukraine financially and even deliver weapons to support Ukraine in its right to self-defence. In this article, we conceptualize different types of actors’ behaviour in world politics. We distinguish between responsible, irresponsible, appropriate, and inappropriate behaviour. We apply this typology to states’ reaction to the Russian war against Ukraine. The typology enables us to analyse the variation of the responses with reference to norms and responsibility, two core concepts of International Relations (IR) Theory and global politics. Counterintuitively as it might seem, we argue that the support of Ukraine with weapons can be categorized as responsible behaviour as it displays an over-fulfilment of the right to self-defence norm, which leads to the emergence of a new norm: the responsibility to support norm.
