http://carnegie.ru/commentary/?fa=64882
http://inopressa.ru/article/19Oct2016/dailybeast/rt.html
http://inopressa.ru/article/19Oct2016/independent/RT_3.html
http://www.euractiv.com/section/energy/news/poland-puts-hopes-in-northern-gate-gas-pipeline/
https://www.chathamhouse.org/expert/comment/businesses-are-chipping-away-sanctions-crimea-and-donbas
http://inosmi.ru/politic/20161018/238039596.html