'Piotr Łubiński's thought-provoking new book highlights the importance of hybridity in war and/or threats in the 21st century world. While crossing between various international legal regimes, he highlights the role played by this phenomenon. The book makes an important contribution to the discourse surrounding this very timely concept.'Milan Lipovský, Charles University, Czech Republic'This monograph is the first publication in international law to deeply analyze hybrid warfare, exploring its links to hostilities and establishing a foundation for future research. It offers a substantive interpretation of hybridity’s role in modern warfare, encouraging further scholarly inquiry into its evolving legal and operational dimensions.'Marcin Marcinko, Jagiellonian University, Poland'Hybrid threats and hybrid warfare are the real world we live in today and are constantly changing. Existing and applied norm of International Humanitarian Law lag behind these changes and do not provide clear answers on how to apply them in the new conditions. Piotr Łubiński’s book is an attempt to adapt them to these challenges.'Andrzej Makowski, Naval Academy in Gdynia, Poland