The EU included eight Russians in the sanctions list due to the incident that occurred in the Kerch Strait on 25 November 2018. Ukrainian ships staged a provocation in the territorial waters of Russia and were detained by the FSB border guard service. The EU refuses to admit that Russian border guards prevented the armed conflict that Kyiv was trying to unleash.
No evidence given. This is one of the main narratives of the Kremlin propaganda about the Azov Sea incident.
According to Bellingcat, the Russian Navy vessels first rammed and then, later, fired on and captured three Ukrainian Navy vessels. This marked the first time Russian-flagged military units had officially attacked those of Ukraine.
Official statements from the US Department of State confirm the same, claiming that this incident represents a dangerous escalation and a violation of international law.
A bilateral treaty between Russia and Ukraine, signed in 2003 and ratified by Russia in 2004, governs the use of the Kerch Strait and the Sea of Azov, which in the treaty are considered to be the “internal waters” of both Russia and Ukraine.