Statements by three arrested Ukrainians have been released by Russia’s security service after Russian ships fired on and seized three Ukrainian boats off the coast of Russian-annexed Crimea.
Volodymyr Lisovyi, one of the men, said he was aware of the “provocative nature” of the Ukrainian action.
But Ukraine’s navy commander said the men had been forced to lie under duress.
Meanwhile, a court in Crimea ordered the first of the 24 Ukrainians captured on Sunday to be detained for 60 days.
Western nations have condemned Russia’s use of force, four years after it seized Ukraine’s southern Crimean peninsula.