Photo from UNIAN

Ukrainian filmmaker Oleh Sentsov, who has been serving a 20-year term in prison in Russia, is facing nasogastric tube feeding if his health deteriorates on the 30th day of hunger strike.

Read alsoMothers of Sentsov and Kolchenko ask Poroshenko to help free their sons (Video)

"When this happens, nasogastric intubation will be used for feeding through the nose. However, if he does not stop refusing to eat after that, the end will be fatal. It was not a threat, the doctor just warned Oleh," Sentsov's lawyer Dmitry Dinze said after visiting the Ukrainian prisoner in the colony in the Russian town of Labytnangi on June 4, RFE/RL's Ukrainian service reported.

"In general, he looks normal, the doctors have been monitoring his state. They've arranged ultrasound checks for him, examined. His innards are in the normal condition, his state is satisfactory," the lawyer said.

As UNIAN reported earlier, Sentsov went on hunger strike on May 14 indefinitely.

This was his protest against the actions of the Kremlin, he demands the release of all the Ukrainian political prisoners held in Russia.