https://jamestown.org/program/russian-navy-ever-less-capable-of-supporting-putins-war-plans/
https://lb.ua/world/2019/04/25/425479_neftyanaya_pikirovka_cherez.html
https://carnegie.ru/commentary/78988
https://jamestown.org/program/russian-proxy-diplomacy-in-syria-crimea-and-sevastopol/
https://www.inopressa.ru/article/24Apr2019/lemonde/zelensky.html
https://www.vedomosti.ru/politics/articles/2019/04/24/800091-predostavlenie-grazhdanstva-dnr-lnr