Russian Ka-27 destroyed over Black Sea, - Ukrainian Navy

Defence forces destroyed a Russian Ka-27 anti-submarine helicopter over the Black Sea.
This was reported by the Ukrainian Navy, according to Censor.NET.
Details
"The Ukrainian Navy destroyed an enemy Ka-27 anti-submarine helicopter over the Black Sea," the statement said.
What preceded this?
Earlier it was reported that Russian air defence forces shot down their own Mi-8 military helicopter in the Rostov region. Three crew members were killed.