https://blogs.lse.ac.uk/europpblog/2023/10/17/why-differentiation-is-now-at-the-heart-of-europes-political-system/
https://www.brookings.edu/research/a-post-american-europe-and-the-future-of-u-s-strategy/
https://www.ips-journal.eu/topics/democracy-and-society/the-berlin-blob-7462/