He said this on Wednesday after a meeting with Russian human rights commissioner Tatyana Moskalkova, Interfax news agency reports.
"I believe that Mr. Sentsov should be released on humanitarian grounds. He can be pardoned for humanitarian reasons," Jagland said.
"If you need a petition for his pardon, I will gladly file it on the basis of the European Convention on Human Rights," the CoE Secretary General said.
In turn, Tatyana Moskalkova said that Sentsov had not asked for pardon.
On May 14, Oleg Sentsov went on an indefinite hunger strike with the demand to release all Ukrainian political prisoners held in Russia and on the territories occupied by Russia.
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