
https://ecipe.org/wp-content/uploads/2026/03/ECI_26_PolicyBrief_05-2026_LY01.pdf

https://dailynewshungary.com/mayors-of-v4-countries-capitals-sign-pact-of-free-cities/

https://www.politico.com/news/magazine/2025/12/21/france-europe-security-trump-00700889