Madonna is calling on her fans to challenge St. Petersburg's recently enacted gay propaganda law.

When Madonna takes the St. Petersburg stage on Thursday – she played Moscow on Tuesday – the queen of pop is preparing to defy authorities and is asking concertgoers to stand in solidarity.

In a Facebook post, she announced that pink wristbands would be handed out “to anyone that wants to support the LGBT community.”

“At Thursday's Madonna concert, a pink wristband will be available to anyone that wants to support the LGBT community in St. Petersburg,” the message read. “The wristbands will be part of the show – be prepared to raise your arm in support!”

Earlier this year, city leaders approved a law which criminalizes “public actions aimed at propaganda of pederasty, lesbianism, bisexuality and transgenderism among minors.”

St. Petersburg Assemblymember Vitaly Milonov, the bill's author, reportedly told the Interfax news agency that the gay icon would be punished if she violated the law.

“If Madonna or one of the organizers of the concert breaks the city law, they will be punished,” Milonov said, adding that he would personally attend Madonna's performance to “monitor the moral content of the concert.”

Police have not said whether wearing the wristband would violate the city's law.

Some local gay rights activists, however, said Madonna should do more.

“In our opinion, it is not enough to say a few words in support of homosexuals between two songs during a concert,” Yury Gavrikov told AFP. “If you position yourself as a defender of human rights then you need to do something more substantial.”

(Related: Elton John: Madonna has been horrible to Lady Gaga.)