Singer Bjork joins Pussy Riot supporters

Iceland's singer-songwriter Bjork has expressed her support for three jailed members of Russian punk band Pussy Riot and suggested that they should be set free.

The Russian women, aged between 20 and 30, face up to seven years in prison if convicted on hooliganism charges over their February performance of a "punk prayer" in Moscow's Christ the Savior Cathedral, calling for then-prime minister Vladimir Putin to quit.

"As a musician and a mother I would like to express I fiercely don't agree with them being put to jail because of their peaceful protest performance," Bjork wrote on her website Friday.

"They are currently standing trial and facing seven years in prison for this. In my opinion, the Russian authorities should let them go home to their families and children."

Bjork has also invited Pussy Riot to join her on stage to perform a song "which was written for all enhancement of justice".