https://lenta.ru/articles/2016/05/30/strategy/
http://www.depo.ua/ukr/politics/yak-ukrayini-rozv-yazati-problemu-donbasu-27052016110000
http://ru.krymr.com/content/article/27766134.html
http://www.politico.eu/article/jean-claude-juncker-trip-to-russia-vladimir-putin-raises-concerns/
http://ru.krymr.com/content/article/27765800.html
http://www.radiosvoboda.org/content/article/27761879.html
https://lenta.ru/articles/2016/05/28/putingreece/