https://stratcomcoe.org/cuploads/pfiles/Nato-Cyber-Report_11-06-2021-4f4ce.pdf
https://www.jstor.org/stable/25472435
https://theconversation.com/berlin-blockade-75-years-on-how-russian-occupation-tactics-in-ukraine-echo-soviet-actions-in-east-germany-207875
https://europa.eu/globalstrategy/sites/globalstrategy/files/regions/files/eugs_review_web_0.pdf