Russian opposition leader Alexei Navalny appeared in court via video link on Wednesday for the start of hearings into complaints against conditions at his penal colony.
Navalny, 44, was jailed in February and is serving two-and-a-half years at a facility outside Moscow on old fraud charges he says are politically motivated.
His detention, which came months after he survived a near-fatal poisoning attack, was met with sharp condemnation from Western countries which slapped fresh sanctions on the Kremlin in response.
The complaints heard Wednesday centre around Navalny's claims that prison authorities are refusing to provide him with books sent to him by relatives, including the Koran, and that they are censoring newspapers he receives.
"It's a bizarre situation", Navalny said according to an AFP journalist in the court in Petushki, 125 kilometres (77 miles) east of Moscow.
"I would like to be given the books that were sent to me".
Navalny was shown in the Petushki courtroom wearing dark prison attire, with hunched shoulders and was less combative Wednesday than in previous hearing in the lead up to his jailing in February.
Last month he ended a 24-day hunger strike initiated to protest a lack of medical attention at what is considered to be one of Russia's most harsh prison facilities.
Navalny said he had only been able to obtain a copy of the Koran after he was transferred in April to a prison hospital, where he received medical attention after announcing the hunger strike.
- 'Absurd' flight risk label -
He also complained in court Wednesday that newspapers he had received in prison appeared to have had articles removed from them with scissors.
"I am not against Penal Colony No. 2 reading my letters. But why cut out newspaper articles?" he said, referring to the facility he was ordered to service his sentence.
The Kremlin's most outspoken critic in Russia also appealed his designation as a flight risk.
In April, he said he was "tortured through sleep deprivation" with guards waking him several times during the night to check he is still in the cell.
"There is not a shred of objective evidence to suggest I am preparing an escape," he told the court, describing the designation as "absurd."
Since Navalny's arrest in February, authorities have moved to dismantle his nationwide political offices and anti-corruption organisation by branding them extremist or terror groups.
Russia's lower house of parliament, the State Duma, on Wednesday approved legislation in its third reading that would ban members of "extremist" organisations from becoming lawmakers.
Members of Navalny's groups and other people involved in their work -- including those who financed them --- could be banned from running in parliamentary elections for several years.
The bill will be considered by the upper house Federation Council next Wednesday and if approved will only require a signature from the president to become law.
The move has been seen as part of efforts to shield the increasingly unpopular ruling United Russia party from real competition ahead of parliamentary elections in September.