Music
Putin's spokesman Dmitry Peskov has denied that the gig took place, but group founder Rod Stephen said that the politician "had a great time" at the performance.
He said that the concert took place at a small theatre off Lake Valdai on January 22 , where they sang 15 Abba songs and were paid £20,000.
Stephen said: "You can hardly have a machine gun in your arms with your top off one minute, then turn around and say you like Abba. I think that's why they've tried to keep it secret."
He added that he thought it was a prank call when the Kremlin originally contacted the group to book the performance.
Last year, Andrew Lloyd Webber claimed that Putin had promised to vote for the UK's entry for the Eurovision Song Contest in 2009.
Related Stories
Singles Reviews
Nelly Furtado: 'Big Hoops' reviewThe singer's comeback confidently ignores all the latest fads.
Music Interviews
David Guetta: My music isn't all the sameDigital Spy talks to the DJ ahead of his London shows this weekend.
The Sound
Playlist: Queen's Diamond Jubilee specialWe select our favourite Queen-related songs ahead of the Diamond Jubilee.
Album Reviews
Ladyhawke: 'Anxiety' reviewThe singer's ear for infectious pop remains stronger than ever on her second LP.
