More than 5,000 dolphins have died as a result of Russia's , scientists have said, blaming sonar devices used by Vladimir 's naval forces.
The true figure could be even higher, according to biologist Ivan Rusev, who said ships and submarines stationed in the Black Sea are causing the deaths.
Rusev, who works at Tuzly Lagoons National Nature Park in Ukraine's southern Odessa region, said just five percent of the dead dolphins are washing ashore.
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