https://www.gazeta.ru/business/2019/04/29/12329065.shtml
https://www.kommersant.ru/doc/3960067
https://www.kommersant.ru/doc/3960047
https://www.svoboda.org/a/usa-today-cold-war-russia-us/29906933.html
https://jamestown.org/program/belarus-threatens-to-cut-off-russias-pipeline-flows-to-europe/
https://www.bbc.com/russian/features-48057093
https://www.gazeta.ru/business/2019/04/25/12322861.shtml
https://www.rbc.ru/newspaper/2019/04/26/5cc18b1f9a79473be2b1a1d4
https://www.svoboda.org/a/29905173.html
https://www.kommersant.ru/doc/3955406