https://www.letemps.ch/opinions/faute-faire-lettre-ouverte-compatriotes-russes-suisses
https://eur-lex.europa.eu/legal-content/IT/TXT/PDF/?uri=CELEX:52019DC0406&from=FR
https://www.esri.ie/system/files/publications/WP677_0.pdf
https://www.bruegel.org/wp-content/uploads/2021/11/PC-23-171121-1.pdf