Paul McCartney is among the many musicians voicing support for the Russian punk rock band P**** Riot, which is facing jail time over a protest against President Vladimir Putin. Joining colleagues such as Pete Townshend, Sting, Yoko Ono, Patti Smith, Madonna and others, McCartney has posted a letter to the band on his official web site reading, "Dear Nadya, Katya and Masha, I'm writing to show my support for you at this difficult time. I would like you to know that I very much hope the Russian authorities would support the principle of free speech for all their citizens and not feel that they have to punish you for your protest. Many people in the civilized world are allowed to voice their opinions and as long as they do not hurt anyone in doing so I believe this is the best way forward for all societies. I hope you can stay strong and believe that I and many others like me who believe in free speech will to everything in our power to support you and the idea of artistic freedom. Wishing you the very best luck, Paul McCartney." The group was arrested in February and charged with hooliganism and violating a public order after performing a "punk prayer" against Putin's re-election. The trio is facing seven years in prison, with a verdict expected Friday (August 17).