
https://www.eda.admin.ch/dam/eda/en/documents/publications/EuropaeischeAngelegenheiten/Schweiz-und-EU_en.pdf

https://www.brookings.edu/essay/lessons-from-ukraine/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=247636212&utm_source=hs_email

https://ec.europa.eu/commission/sites/beta-political/files/communication-credible-enlargement-perspective-western-balkans_en.pdf