In declaring independence, drafting a constitution, regulating citizenship and issuing passports, micronations position themselves as rival sites of authority. In this chapter, we explore the different ways that internationally recognised states respond to micronations’ claims to sovereignty. This chapter reveals that even though micronations are largely ignored in the international relations, political science and legal literature, in practice states must take notice and consider appropriate ways to engage. In some cases, perceiving their existence as a provocation or threat to their own claims of authority and to jurisdiction, states act in swift and decisive ways to foreclose micronations’ scope of action. In other cases, states determine to ignore micronations, considering them to be unserious or unthreatening. In all circumstances, however, states deny the international legal personality of micronations and ensure that any encounter occurs entirely within and according to domestic law.