https://www.foreignaffairs.com/europe/promise-and-peril-eu-expansion
https://abouthungary.hu/speeches-and-remarks/interview-with-prime-minister-viktor-orban-for-the-portal-index-hu
https://blogs.lse.ac.uk/brexit/2019/10/09/northern-ireland-depends-on-the-eus-fluid-borders-for-survival/