Around 300 Brazilian soccer fans took over a central Moscow square on Tuesday, throwing a samba party in front of the Bolshoi Theatre and taking city police by surprise.

Latin Grammy award nominee Diogo Nogueira, himself a soccer player until a knee injury ended his sporting career, sang from an open-top bus as the square turned into a sea of green and yellow, Brazil's national colours.

"The World Cup is not only (about) football. It's a unity of cultures," said samba drummer Wallace Leite, whose face was painted a bright green.

"I'm here to represent Brazil to all these people, to show a little bit of Brazil and of course to learn (about) Russian culture as well."

Moscow police soon asked the bus and its powerful sound-system to move on, bringing the street party to a close.

But Russians and foreign fans still got a taste of Brazilian culture.

"Though I'm not a football fan at all, there's a mad energy here... I feel great," said one Muscovite, who gave her name as Asira.

"It's a Brazilian carnival, a Brazilian soap opera. Everything here is Brazilian."

Brazil will next Serbia in their final Group E match in Moscow on Wednesday.

The five-time World Cup winners have been criticised at home for their performance in the tournament so far, drawing with Switzerland and securing a last-gasp victory over Costa Rica in the very final moments of the match.