Pussy Riot: Russian protests are 'battle for hearts and minds'

Thousands of people were detained across Russia during protests in support of jailed opposition leader Alexei Navalny last week.

The lead singer of the Russian punk group Pussy Riot - long-time critics of President Putin - has released a song in support of the protesters.

Nadya Tolokonnikova spoke to the BBC Russian Service's Petr Kozlov.