The European Secure Software Defined Radio (ESSOR) is a PESCO (Permanent Structured Cooperation) project. PESCO was established in 2017 to deepen defence cooperation among the Member States of the European Union. (Art. 46.2, Lisbon Treaty)Its aim is “to jointly arrive at a coherent full spectrum of defence capabilities available to Member States for national and multinational missions and operations”. Since its establishment, PESCO has been undertaking new projects, and on 6 March 2018, a list of 17 projects was adopted by the Council, then a second list of another 17 projects was adopted on 20 November 2018, and finally, a third batch was adopted on 12 November 2019.