https://www.osw.waw.pl/sites/default/files/pw_69_pesco_ang_net.pdf
https://www.eeas.europa.eu/sites/default/files/documents/strategic_compass_en3_web.pdf
https://www.politico.eu/article/german-defense-minister-pushes-for-international-security-zone-in-syria/?utm_source=POLITICO.EU&utm_campaign=e0c823e03f-EMAIL_CAMPAIGN_2019_10_25_05_00&utm_medium=email&utm_term=0_10959edeb5-e0c823e03f-190380769
https://static.rusi.org/202303-SR-Unconventional-Operations-Russo-Ukrainian-War-web-final.pdf.pdf