
http://ec.europa.eu/eurostat/statistics-explained/index.php/Acquisition_of_citizenship_statistics

https://ec.europa.eu/home-affairs/system/files/2022-03/recommendation%20limit%20access%20individuals%20connected%20Russian%20Belarusian%20government%20citizenship%20residence%20EU%20through%20investor%20schemes_en.pdf

https://blogs.lse.ac.uk/europpblog/2025/08/29/the-low-ambition-equilibrium-why-integration-policies-are-putting-refugees-on-a-fast-track-to-nowhere/