https://www.eca.europa.eu/Lists/ECADocuments/REW19_09/REW_EU-defence_EN.pdf
https://blogs.lse.ac.uk/europpblog/2023/10/17/why-differentiation-is-now-at-the-heart-of-europes-political-system/
https://dwfgroup.com/en/news-and-insights/insights/2022/10/new-subsidy-control-regime-to-come-into-effect-from-wednesday-4-january-2023