Ukraine's Verkhovna Rada Human Rights Commissioner Liudmyla Denisova has written a letter to Mikhail Fedotov, chairman of the Russian presidential human rights council, in which she is asking him to report on the state of health of Ukrainian filmmaker Oleh Sentsov, who is serving his term in a Russian prison.

"I have received information on the considerable deterioration of the health of Oleh Sentsov, who declared a timeless hunger strike on May 14, 2018 and has been on hunger strike for 68 days now. According to the lawyer's information, Oleh Sentsov has recently had a second crisis [...] According to the information provided by the layer, Sentsov has difficulty following dates and asked several times what day it was when he met with his defense lawyer," the human rights commissioner said in her letter to Fedotov, a photocopy of which she posted on Facebook on Friday.

Denisova also said, citing the lawyer's information, that Sentsov has been taken to a hospital in Labytnangi, where doctors insisted that he be force-fed a special mixture in large amounts entirely.

"Oleh Sentsov refused to be fed, but reached a compromise with the doctors and is now taking 3-4 spoonfuls of nutrient mixture a day under medical supervision," she said.

"In view of what has been said, I am asking to be informed on the current state of health of Oleh Sentsov, providing relevant confirmation documents," Denisova said in her letter to Fedotov.

Besides, she has written letters to Secretary General of the Council of Europe Thorbjorn Jagland, Nations High Commissioner for Human Rights Zeid Raad Al Hussein and Council of Europe Commissioner for Human Rights Dunja Mijatovic asking them to assist with an urgent medical examination of Oleh Sentsov by Ukrainian and foreign doctors and promote his release on humanitarian grounds.

In August 2015, the North Caucasus District Military Court sentenced Sentsov, who was detained in Crimea in 2014, to 20 years in a high-security penitentiary.

Sentsov is held in the Russian colony Bely Medved beyond the polar circle in the Yamalo-Nenets Autonomous District. He went on hunger strike on May 14,2018, demanding that all Ukrainians held in Russia be released.