The defence forces of southern Ukraine have summed up the losses of the Russian Black Sea Fleet in March.
In March, the Russian patrol ship Sergey Kotov sank, and the large amphibious assault ships Konstyantyn Olshanskyy, Yamal, Azov and the reconnaissance ship Ivan Khurs were damaged.
"It was a bad month for the Russian Black Sea Fleet," the military said.
The Russian side did not report these losses.