The story appeared in Russian paper Izvestia, which reported the U.S. Navy will deploy 20 combat dolphins and 10 sea lions into the Black Sea.
British paper Daily Mirror reported, "The specially-trained dolphins attack enemy divers, hunt for mines and even plant bombs."
He told Foreign Policy the Navy official quoted in the original Russian report has been retired for nearly a decade.
Now, despite the supposed misreporting, the story isn't completely out of left field.
Same goes for Russia. In a dolphin arms race of sorts, the Soviets maintained a marine-mammal program of their own until the USSR fell apart. When Ukraine gained its independence, it got to keep its bottle-nosed comrades. (Via History Channel)
Then reports of dolphins defecting emerged last month. Russian state media reported Russia was annexing not only Crimea, but the region's military dolphin program along with it. (Via Vice)
It's not entirely clear what the Russian navy plans to do with its newly acquired dolphin fleet, but for now, it's probably safe to say there's no reason to expect a dolphin vs. dolphin proxy war in the Black Sea anytime soon.