A member of the controversial Russian art collective Voina (War) charged with flipping over a police car has been put on the international wanted list after skipping bail, it emerged in court on Thursday.

Vorotnikov failed to turn up at a police questioning in May and his whereabouts have since been unknown.

Earlier this week, the judge ruled that Vorotnikov had forfeited his 300,000-ruble ($10,000) bail.

Two of the group's leaders, Leonid Nikolayev and Oleg Vorotnikov, were released on bail in March after nearly four months awaiting trial for an audacious protest called Palace Revolution, in which they flipped over a police car to protest against corruption. They were charged with hooliganism and face up to five years in prison.

Vorotnikov is also suspected of attacking and insulting police during an unsanctioned rally in St. Petersburg on March 31.

Nikolayev has also jumped bail, and a judge will decide on Friday whether his bail money is also forfeit.

Voina is notorious for a number of actions, including holding an orgy in a Moscow museum to mark the 2008 inauguration of President Dmitry Medvedev and painting a 65-meter phallus on a drawbridge opposite the St. Petersburg headquarters of the Federal Security Service. The group won a state prize for contemporary art in April for A Cock Captured by the FSB.