https://www.opendemocracy.net/en/can-europe-make-it/perception-and-politics-the-case-of-poland-coping-with-political-apparitions/
https://www.ceps.eu/will-putins-war-in-ukraine-make-the-eu-stronger/
https://www.brookings.edu/wp-content/uploads/2018/03/fp_20180316_future_political_warfare.pdf