Madonna has voiced her support for incarcerated Russian punk stars P*ssy Riot and urged the judge overseeing their hooliganism trial to be "lenient".

Feminist rockers Nadezhda Tolokonnikova, Maria Alekhina and Yekaterina Samutsevich are currently on trial and face up to seven years in jail after they went public with their opposition to Russian President Vladimir Putin by playing their anthem Holy S**t at Moscow's Christ The Saviour Cathedral in February.

British rockers Jarvis Cocker, Pete Townshend and Johnny Marr are just some of the stars who have shown their support for the embattled trio by signing a petition demanding a fair trial for P*ssy Riot, and now Madonna has used her superstar status to draw attention to the case.

She tells the Associated Press, "I'm against censorship, so I hope that the judge is lenient with them and that they are freed soon."

Tolokonnikova recently spoke out about the group's arrest, claiming the impromptu gig in Moscow was staged in opposition to Putin's re-election campaign. She insisted she didn't mean to cause offense by performing the protest song in a church.

The three artists face up to seven years in jail if convicted.