https://novayagazeta.ru/articles/2019/12/12/83128-slovom-protiv-nasiliya
https://www.radiosvoboda.org/a/30318455.html
https://www.radiosvoboda.org/a/news-zelensky-putin/30318446.html
https://ru.krymr.com/a/portnikov-krym-gaz-i-normandskiy-format/30308781.html
https://www.radiosvoboda.org/a/portnykov-krym-haz-i-normandskyi-format/30309824.html