NATO küberkaitsekoostöö keskus sai uue juhierr.ee2025 https://www.err.ee/1609698405/nato-kuberkaitsekoostoo-keskus-sai-uue-juhi NATO's large-scale cyberdefense exercise Locked Shields underway in Tallinn [Online resource]news.err.ee2022 "NATO's large-scale cyberdefense exercise Locked Shields underway in Tallinn"