Madonna's concert draws Russia's wrath

US pop icon Madonna drew the wrath of Russian ministers and the mighty Church again Thursday as she took her gay rights activism to a city that has just banned "homosexual propaganda."

The gay community icon stripped to her bra on stage to reveal the words "No Fear!" written on her back as she preached the dangers of societies that fail to treat their own people with "dignity, with respect and with love."

"Show your love and appreciation for the gay community," she called as a sea of hands shot up to display pink bracelets that her team had distributed to the 10,000-strong crowd.

The pop legend's show in strongman leader Vladimir Putin's native Saint Petersburg came two days after she donned a balaclava on a Moscow stage in solidarity with the jailed all-girl protest punk band Pussy Riot.

Madonna had stripped to a black bra in Moscow on Tuesday to reveal the words "Pussy Riot" on her back.

Prosecutors have sought three years in a corrective labor facility for the band on charges of hooliganism for their church performance of an anti-Putin "punk prayer". The verdict will be handed down August 17.

On Thursday, Madonna's lightning-rod antics and outspoken reputation again created a combustible mix, in a city that this year passed controversial anti-gay legislation that some Putin allies hope to apply nationwide.

The US embassy in Moscow warned this week that its Saint Petersburg consulate had "received information regarding a threat of physical violence against spectators and performers."

The governor deployed 300 police to the Saint Petersburg Sport and Concert Complex as priests vowed to burn pictures of the US pop star and sprinkle holy water on sites she visited on her last stop in the city in 2009.

The war of words between Madonna and her hosts was in full swing hours before the concert's scheduled, and inevitably delayed, late evening start.

Russia's deputy prime minister and former NATO envoy Dmitry Rogozin used an epithet he declined to spell out in an angry tweet about Madonna's moral values.(AFP)