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
https://focus.ua/world/357901/
http://www.ng.ru/politics/2016-10-18/3_udo.html
http://www.ng.ru/politics/2016-10-18/3_partii.html