The small boat speeds toward a much larger ship in the distance, cutting through choppy waves and dodging gunfire, presumably from a helicopter shown hovering above. A now-viral video of its journey ends inconclusively, without showing its fate or what happened to what is suspected to be its intended target: Russia’s strategically important Black Sea Fleet. The original source of the video and the origin of the vessel it was taken from remain unconfirmed. But military experts say they believe it to be footage from a remote-controlled attack on the Russian naval fleet off the Crimean port city of Sevastopol...