https://deliverypdf.ssrn.com/delivery.php?ID=095121121119090086085098070080069078040064035059032043111087094103027021067090111119120010051124040104010080111122122122080003038022029046084101122031105071000067066000092021086071011095093102098123092099065016093095094122024108087086024083078114093098&EXT=pdf&INDEX=TRUE
http://carnegieeurope.eu/2017/10/23/nato-s-eastern-flank-and-its-future-relationship-with-russia-pub-73499?mkt_tok=eyJpIjoiT1dWaU5URTRObVUzTTJZMCIsInQiOiI0RXM5cDl1eEh0TVpcL1wvXC9KeHJTeW9rdExFTDN5U3hZWFRBRE1cL1BtVkpYN3U3RHVmSnJTUGFabkdRaVN6Rnk1eWFSMXlUVFh4WkNTMDRpdExWTStBdnlhWU42UVwvQzdLeTFmMktzUzBjUG55TVNzV0hKRk1pb0Y0dlwvMGdrdWlHMiJ9
https://rusi.org/sites/default/files/20200324_defence_and_integrated_review_readyforweb.pdf