In urging a boycott of Sir Elton John's upcoming concerts in Moscow and Kazan, a Russian Islamic religious leader has accused the singer of promoting sodomy.

Seidzhagfar Lutfullin, the imam of Kazan's Thousandth Anniversary of Islam Mosque, warned that John's promotion of gay unions could be a Sodom and Gomorrah moment for Russia.

“Sodomy … is what the world famous homosexual Elton John, who recently wed a man in public, is promoting,” Lutfullin said in a statement on his mosque's website.

John is scheduled to perform in Moscow and Kazan in early December.

The openly gay singer's appearance has also been criticized by Yuri Ageshchev, coordinator for Union of Orthodox Brotherhoods, The Moscow Times reported.

“The statement by this gay guy – Elton John – about his support for gays and other perverts during the upcoming concert in Moscow is an insult to all Russian citizens,” he is quoted as saying. “It also makes a mockery of our recently enacted law against the public propaganda of gay ideas.”

The 66-year-old John, who is touring to promote his new album, is in a British civil partnership with David Furnish. The couple is raising two boys.

(Related: Elton John credits fatherhood as inspiration behind new album.)

In June, Russian President Vladimir Putin signed legislation that prohibits the public promotion of gay rights. Russia's “gay propaganda” law has provoked calls for a boycott of next year's Winter Olympics in Sochi.

Earlier, John said that he wanted to include Russia in his tour to support the country's gay community.

“I've got to go,” he told UK's The Guardian. “And I've got to think about what I'm going to say very carefully. There's two avenues of thought: do you stop everyone going, ban all the artists coming in from Russia? But then you're really leaving the men and women who are gay and suffering under the anti-gay laws in an isolated situation. As a gay man, I can't leave those people on their own without going over there and supporting them. I don't know what's going to happen, but I've got to go.”