The Oleg Naidenov was seized by Senegalese forces Jan. 4 after the country said the ship was illegally fishing in its waters. Medics who examined the crew confirmed its captain and two sailors had been beaten, boosting Russian claims previously the ship was seized with undue use of force, RIA Novosti reported.
It has since been towed to the port of Dakhar though the crew has not been permitted to leave, the report said.
Instead, the crew has been granted more food and potable water after complaints supplies were running low.
The ship had once before been seized for poaching but Russian foreign ministry officials insisted no fishing was taking place at the time of the seizure and the ship was in international waters.
Russian officials pledged to sue Senegal in the International Tribunal for the Law of the Sea, an international body whose ruling the Russian government recently ignored in regards to a Dutch Greenpeace boat the Russian government seized in the Arctic Ocean because it was protesting oil drilling there.