RIA Novosti informs about it.
"The control ship" Donbass "lay on the opposite course from the Kerch Strait, does not respond to requests," the message says.
It is noted that the actions of the ship's crew are regarded as provocative.
Earlier, the FSB reported about a Ukrainian Navy ship moving towards the Kerch Strait.
The department said that the actions of the ship pose a threat to navigation.