The former Moscow police officer was jailed for 20 years in 2014 for the murder of a female journalist.
One of the five men convicted over the 2006 murder of a Russian female journalist has been pardoned after fighting in Ukraine.
The former Moscow police officer was jailed for 20 years at a trial in 2014.
His lawyer said the pardon came after he had completed a six-month military contract.
The investigative reporter and vocal critic of Russia's war in Chechnya was shot in a lift in her block of flats.
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