https://www.robert-schuman.eu/en/doc/entretiens-d-europe/ee-100-en.pdf
https://www.brookings.edu/essay/lessons-from-ukraine/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=247636212&utm_source=hs_email
https://www.rferl.org/a/russia-lithuania-kaliningrad-cutoff/31906501.html?utm_source=POLITICO.EU&utm_campaign=ce30c8dfb0-EMAIL_CAMPAIGN_2022_06_21_05_10&utm_medium=email&utm_term=0_10959edeb5-ce30c8dfb0-190380769
https://blogs.lse.ac.uk/europpblog/2023/03/06/the-great-blunder-why-did-putin-miscalculate-over-ukraine/