https://www.brookings.edu/articles/want-ukraine-in-the-eu-youll-have-to-reform-the-eu-too/
https://www.ips-journal.eu/topics/democracy-and-society/a-glimmer-of-hope-7132/
https://ecfr.eu/wp-content/uploads/Ambiguous-alliance-Neutrality-opt-outs-and-European-defence.pdf