NEW-YORK, August 9 - RAPSI. The attorney for Russian national Viktor Bout, who was sentenced in April to 25 years in a US prison, has requested that the court of appeals extend the term for appealing the sentence until February 1, 2013, RIA Novosti reported on Thursday.

Albert Dayan said he filed the request because of the large volume of case materials, as well as difficulties in communicating with his client, who is in an Illinois prison and has limited visitation rights.

Dayan stated that it would be unrealistic to submit an appeal by November 1 under these circumstances.

The attorney claims that Bout's detention conditions, which hinder his ability to participate in the appeals process, are "unjust and illegal." He said that there are over 1,700 pages of material and a host of audio tapes in Bout's case.

The prosecutor's office has indicated that it doesn not mind extending the deadline for filing the appeal, Dayan said.

Dayan is determined plans to dispute the legality of 8-10 elements of Bout's arrest on appeal.

Bout was arrested in Thailand in March 2008 during a sting operation led by U.S. agents and extradited to the United States in November 2010 after spending more than two and half years in a Thai prison. The jury of the Federal District Court of New York found him guilty of conspiring to kill U.S. officials and citizens, of acquiring and intending to sell Russian-made anti-aircraft missiles and providing support to the Revolutionary Armed Forces of Colombia (FARC), considered a terrorist group by the United States. Bout was sentenced to 25 years in prison.