AMSTERDAM, May 25 (Reuters) - Former Bosnian Serb policeman Dragan Zelenovic has appealed against a 15-year jail sentence imposed by the U.N. war crimes tribunal for the rape and torture of Bosnian Muslims in the 1992-1995 war.

His lawyer said in a filing released by the tribunal on Friday that his sentence should be reduced because of mitigating factors, arguing that he cooperated fully and his admission of guilt had relieved his victims of the obligation to testify.

"The defence is proposing that the Appeals Chamber accept the appeal, make a correct assessment of the mitigating circumstances in the case where the Trial Chamber erred," Zelenovic's lawyer said.

Last month, the tribunal found Zelenovic, a 46-year former paramilitary leader, guilty of personally committing nine rapes of women in Serb detention, eight of which qualified as both torture and rape, and four of which were gang rapes.

His lawyer had argued for a sentence of 7-10 years, while prosecutors pushed for 10-15 years.

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