
https://www.europarl.europa.eu/RegData/etudes/BRIE/2023/754632/EPRS_BRI(2023)754632_EN.pdf

https://ecipe.org/wp-content/uploads/2022/01/ECI_22_PolicyBrief-TheEuDigital_02_2022_LY03.pdf

https://www.brookings.edu/articles/europes-messy-russian-gas-divorce/