The punk band are accused of hooliganism on the grounds of religious hatred after they performed a song mocking the Russian President on the altar of an Orthodox cathedral.
© Rex Features / Kommersant Photo Agency
"There is nothing good in what they did [but] I don't think they should be judged too severely," Putin told reporters in London, according to BBC News.
Amnesty International has condemned the Russian authorities' treatment of Maria Alekhina, Ekaterina Samutsevich and Nadezhda Tolokonnikova, who face up to seven years in prison.
Pussy Riot have received support from the likes of Madonna, Sting and the Red Hot Chili Peppers.
Kate Nash has also backed the group, encouraging fans to make 'Free Pussy Riot' posters.
Their trial began on Monday. Medics were called to the court on Wednesday when the women complained of feeling unwell, saying they are being deprived of sleep and fed poorly.
