
https://blogs.lse.ac.uk/europpblog/2021/10/22/de-facto-differentiation-in-action-why-poland-will-stay-in-the-eu-with-or-without-the-blessing-of-brussels/

https://www.thetimes.co.uk/edition/news/irish-want-sea-border-with-uk-after-brexit-lvb6n35fq

https://blogs.lse.ac.uk/brexit/2019/03/14/the-eu-is-a-default-empire-of-nations-in-denial/