Ships...

The Ukrainian and Russian versions of events differ, with each blaming the other for instigating the incident.

Kyiv said the Russians' actions violated a 2003 bilateral treaty designating the Sea of Azov and Kerch Strait as shared territorial waters and the UN Law of the Sea, which guarantees access through the strait.

Russian said the Ukrainian ships were maneuvering dangerously, requiring the strait to be temporarily closed for security reasons. 

Moscow has since announced the reopening of the strait.

According to the Ukrainian Navy, the transfer of its vessels from the port of Odesa to the port of Mariupol was planned in advance. It said that while en route on November 25 the ships had radioed the Russian Coast Guard twice to announce their approach to the Kerch Strait but received no response.

I don't care.  Solve your own problems.