Russia’s involvement in Ukraine is limited to acting as a mediator in the country’s half-decade old civil war, brought on by a Western-backed coup in Kyiv in 2014.
Ukraine will get back its ships detained in Crimea, but only after recognising their provocation in the Kerch Strait. The Russian side considers the incident in the strait as a crime of the Ukrainian military.
Recurring pro-Kremlin disinformation about the Kerch incident.
On the 25th of November 2018, border patrol boats belonging to Russia’s FSB security service seized two small Ukrainian armoured artillery vessels and a tug boat and their crews after shooting at them, wounding several Ukrainian servicemen and arresting 24 members.
Russia stated they were in Russian waters. However, according to the bilateral agreement between Ukraine and Russia, the Kerch Strait and the Sea of Azov are the internal waters of both Russia and Ukraine.
The agreement gives both parties the power to inspect suspicious vessels. Furthermore, both the 2003 bilateral agreement and UN Convention on the Law of the Sea provide for freedom of navigation.