It also finds that some were mistreated in custody, mainly through verbal and in some cases physical abuse.

Reports of people being mistreated in custody are still frequent, six months into Putin's third, six-year term as president.

His sentence reflected a plea deal that saw some of the more serious charges against him dropped amid allegations he was mistreated in custody.

Nothing has been done about money laundering and instead many poor young men have been arrested and are often mistreated in custody, he said.