An open source analysis of the Kerch Strait incident that involved a violent clash between the Russian and Ukrainian navies.
http://novosti.dn.ua/article/7189-chto-proyskhodyt-v-azovskom-more-y-pochemu-neprava-rossyya
https://www.radiosvoboda.org/a/donbas-realii/29628819.html
http://www.kasparov.ru/material.php?id=5C01183AEB616
http://www.kasparov.ru/material.php?id=5C00CBA057FD0
https://www.ostro.org/donetsk/politics/articles/559441/
https://ru.krymr.com/a/politico-chem-naglee-putin-tem-bespomoshchnee-zapad/29628410.html
https://tyzhden.ua/Politics/223463