Russian warplane had destroyed a Ukrainian reconnaissance boat in the Black Sea, the Russian Defense Ministry said on Tuesday.
The military stated that the boat sailed near Russian gas production facilities.
The statement did not give details on what kind of boat had been destroyed, or where exactly the incident had taken place.
Attacks from both sides have escalated in the Black Sea since Russia pulled out of a deal that had allowed safe export of Ukrainian grain through the shipping hub.
Russian defenses repelled Monday a Ukrainian attack with two drones that targeted the Crimea peninsula.
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