MOSCOW (Reuters) - The Kremlin said on Thursday it had received a letter from the mother of jailed Ukrainian filmmaker Oleg Sentsov asking Russian President Vladimir Putin to pardon her son.

Russia's President Vladimir Putin speaks during an award ceremony of the members of the national soccer team at the Kremlin in Moscow, Russia, July 28, 2018. Pavel Golovkin/Pool via REUTERS

The Crimea-born Sentsov, sentenced by a Russian court to 20 years in a high security penal colony in 2015 for “terrorist attacks” on the peninsula, is on the 88th day of a hunger strike.

Sentsov was accused of setting fire to two office buildings in Crimea, including one of Russia’s ruling party, and of plotting to blow up a monument to Soviet state founder Vladimir Lenin.

He was charged with organizing a “terrorist group” in Crimea aiming to wrest the peninsula back from Moscow’s control. Russia annexed Crimea in 2014.

The film director has denounced the trial as politically motivated, amid high tension between Russia and the West over the annexation.

Sentsov’s mother Ludmila wrote to Putin on June 22.

“I ask you... not to ruin his life,” the letter, published by the Echo of Moscow radio station, said.

“He has now spent four years in prison. His children are waiting for him, and his youngest son has autism. They are struggling without him,” she wrote.

On Thursday, Kremlin spokesman Dmitry Peskov confirmed the letter was received.

A commission must now be set up to gather reports on Sentsov’s health, behavior and mental state, a journalist from the Novaya Gazeta newspaper cited Sentsov’s lawyer as saying.

The commission will then assess whether he presents a danger to society and will make a recommendation for Putin to review, the lawyer, Dmitry Dinze, was cited as saying.

40 BEATS A MINUTE

Sentsov’s health is rapidly declining, his lawyer and a relative said.

“Things are not just bad, they’re catastrophically bad,” Sentsov’s cousin, Natalya Kaplan, wrote on social media on Wednesday.

“He can barely get up. He writes that the end is near, and he’s not referring to when he will be freed,” Kaplan said.

Speaking to Ukrainian newspaper Hromadske on Tuesday, Sentsov’s lawyer said the filmmaker’s heartbeat had slowed to 40 beats per minute and he was suffering from anemia.

Amnesty International said it had requested access to visit Sentsov together with medical experts, but was denied.

“The Federal Correctional Service told us that his health is stable and they see no changes for the worse. But that information is two weeks old. Sadly, we know as little as everyone else,” Amnesty’s Aleksander Artemev said.