EUISS YEARBOOK OF EUROPEAN SECURITY 2021 provides an in-depth analysis of the European Union's security challenges and responses. The book covers various topics, including the EU's response to Covid-19, multilateralism, EU voting at the United Nations, Turkey and the Western Balkans, Turkey and the southern neighbourhood, North Africa, the Middle East and the Gulf Region, Sub-Saharan Africa, and the eastern neighbourhood. The book also examines the role of Russia in the region. Overall, the yearbook provides valuable insights into the EU's security policies and challenges.