
https://www.ips-journal.eu/topics/foreign-and-security-policy/the-enemy-of-my-enemy-6964/

https://www.publications.parliament.uk/pa/ld201617/ldselect/ldeucom/169/169.pdf

https://www.rtbf.be/article/le-traite-de-brest-litovsk-en-1918-quelles-lecons-tirer-de-cette-partie-de-poker-pour-la-paix-en-ukraine-11512020