Russians have recently started to take turns deploying one submarine at a time to the Black Sea, posing a threat due to the presence of Kalibr missiles, according to the spokesperson of the Ukrainian Navy, Dmytro Pletenchuk. “They are currently there, as we can see, in rotation. This is a tactic chosen by our enemy: maintaining a presence in the Black Sea is ensured by the constant presence of a submarine,” he said. Pletenchuk reported that the Russians have four submarines in the Azov-Black Sea region, three of which are carriers of Kalibr cruise missiles. “They are rotating the single submar…