This videotape allegedly shows Russian Navy commandos on a Somalian pirate ship shortly after the pirates had captured a Russian oil tanker. The Euro Union navy that patrols these waters would not interfere because they feared there could be casualties.
All explanations are in Russian with a single exception of when a wounded pirate says something in English and the Russian soldier says "This is not a fishing boat." All conversations between the commandos are in Russian. If you don't understand Russian, the pictures may speak for themselves.
The soldiers appear to free their compatriots and the tanker. The Russian Navy Commandos moved the pirates back to their own (pirate) ship, searched the pirate ship for weapons and explosives, and then they left the ship and exploded it with all remaining pirates hand-cuffed to it.
The commandos seem to have sank the pirate ship along with the pirates without any court proceedings or involvement of lawyers. That is, they apparently used the anti-piracy laws of the 18th and 19th centuries where the captain of the rescuing ship has the right to decide what to do with the pirates. Usually, they were hung.