https://www.radiosvoboda.org/a/news-ssha-rosia-provokatsii-ukraina/31188272.html
http://www.kasparov.ru/material.php?id=606B2D459DA1D
https://www.derstandard.at/story/2000125572656/russland-wird-zum-drittgroessten-oellieferant-der-usa
https://www.ng.ru/economics/2021-04-04/1_8119_russia.html
https://ru.krymr.com/a/ssha-rossiya-kitay-obostreniye-otnosheniy-sankcii/31186065.html
https://www.kommersant.ru/doc/4760286
https://novayagazeta.ru/articles/2021/04/03/odinochestvo-rossii
https://www.radiosvoboda.org/a/donbas-ukrayina-rosiya/31183149.html
https://www.radiosvoboda.org/a/news-biden-zelensky-donbas/31184005.html