The majority of irregular arrivals by sea to the European Union (EU) occur in the Mediterranean. Although the phenomenon is not widespread throughout the EU, it affects the EU as a whole. This publication reviews the solidarity measures the EU has established to support those countries most affected by irregular arrivals by sea. It will focus on the fundamental rights challenges raised by such measures but will not discuss whether these measures are sufficient and adequate for genuinely sharing the costs associated with the arrivals. This publication will also touch upon EU funding instruments and intra-EU relocation from Malta and more thoroughly describe the operational cooperation with Frontex.