The DIU reports this.
“It is clear that you all already know all this. Our tragic event took place at night, respectively, at 00:50 unmanned boats in the amount of 5 units attacked the small patrol ship “Kotov”, which, together with us, is on combat duty for air defense and is located accordingly, I’m under control,” the occupier with the call sign “Fog” reported, probably to the high command.
He admits that the ship "was attacked by 5 BECs."
“I don’t know how they fought with him for 40 minutes. Then 40 minutes before that there was information that there were five BECs in the Kotov area. There was a helicopter there, and there was the ship itself with weapons, an AK-176630 (a universal naval gun mount caliber 76.2 mm of the Russian Navy, – ed.),” added “Fog”.