The paper presents the principle aspects of key European Union legislation concerning critical infrastructure
protection. Fundamental definitions and assumptions covered by the respective documents, with a special
focus on critical infrastructure, its identification and protection, are also included. Basic outcomes of the
regulations, reflecting other acts of law concerning the rights and obligations of States within their territorial
sea and exclusive economic zone, regarding specific matters related to the Baltic Sea area and EU member
states located around it, have also been introduced. Some approaches to the modelling of ECI identification is
also given, and analysis of the latest EU activities, associated with the adaptation of critical infrastructure
systems to climate change predictions, is introduced. As the vulnerability to the impact of climate change is
of key importance for systems operating within the Baltic area, essential findings that apply to them are also
covered.