"A Russian military ship approached Mariupol," the website wrote and published a snapshot of the vessel.

The warship was spotted 19 kilometers from Mariupol.

Read alsoUkraine intel says Russia may resort to amphibious assault on Azov coastAccording to Kindsfater, the intelligence team saw the Russian coast guard vessel "Tikhiy Don" 12 miles from the coast, on a COMINT mission.