Russian artist Vasily Slonov poses for a photograph with a giant axe decorated with a portrait of Russian businessman and politician Mikhail Prokhorov and another axe with a portrait of Russian President Vladimir Putin as he prepares for an exhibition of his new art project in Russia's Siberian city of Krasnoyarsk December 15, 2013. The artist has chemically engraved portraits of Soviet and Russian political figures on a series of butchers' axes. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

Russian artist Vasily Slonov puts a giant axe decorated with a portrait of Russian businessman and politician Mikhail Prokhorov in his car as he prepares for an exhibition of his new art project in Russia's Siberian city of Krasnoyarsk December 15, 2013. The artist has chemically engraved portraits of Soviet and Russian political figures on a series of butchers' axes. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

Russian artist Vasily Slonov and an assistant carry a giant axe decorated with a portrait of Russian businessman and politician Mikhail Prokhorov from his workshop as he prepares for an exhibition of his new art project in Russia's Siberian city of Krasnoyarsk December 15, 2013. The artist has chemically engraved portraits of Soviet and Russian political figures on a series of butchers' axes. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY TPX IMAGES OF THE DAY) 

Russian artist Vasily Slonov sharpens an axe decorated with a portrait of Russian businessman and politician Mikhail Prokhorov in his workshop as he prepares for an exhibition of his new art project in Russia's Siberian city of Krasnoyarsk December 15, 2013. The artist has chemically engraved portraits of Soviet and Russian political figures on a series of butchers' axes. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

NBA Brooklyn Net's principal owner Mikhail Prokhorov (C) shakes hands with general manager Billy King in front of head coach Jason Kidd (R) after a news conference in Brooklyn, New York July 18, 2013. REUTERS/Adam Hunger (UNITED STATES - Tags: SPORT BASKETBALL) 

Newly acquired Brooklyn Net's Paul Pierce (2nd R), Kevin Garnett (3rd R) and Jason Terry (R) hold up their new jerseys as they pose for a photo with the NBA team's principal owner Mikhail Prokhorov (2nd L), general manager Billy King (L) and head coach Jason Kidd after a news conference introducing them to the media in Brooklyn, New York July 18, 2013. REUTERS/Adam Hunger (UNITED STATES - Tags: SPORT BASKETBALL) 

Newly acquired Brooklyn Net's Paul Pierce (L), Kevin Garnett (2nd R) and Jason Terry (R) hold up their new jerseys as they pose for a photo with principal owner Mikhail Prokhorov after a news conference introducing them to the media in Brooklyn, New York July 18, 2013. REUTERS/Adam Hunger (UNITED STATES - Tags: SPORT BASKETBALL) 

Newly acquired Brooklyn Net's Paul Pierce (L), Kevin Garnett (2nd R) and Jason Terry (R) hold up their new jerseys as they pose for a photo with principal owner Mikhail Prokhorov after a news conference introducing them to the media in Brooklyn, New York July 18, 2013. REUTERS/Adam Hunger (UNITED STATES - Tags: SPORT BASKETBALL) 

Russian billionaire Mikhail Prokhorov attends a news conference, dedicated to addressing issues in the upcoming Moscow mayoral elections, in Moscow June 13, 2013. The Russian capital's first direct mayoral elections in a decade will be held on September 8. REUTERS/Sergei Karpukhin (RUSSIA - Tags: BUSINESS POLITICS ELECTIONS HEADSHOT) 

Russian billionaire Mikhail Prokhorov speaks during a news conference, dedicated to addressing issues in the upcoming Moscow mayoral elections, in Moscow June 13, 2013. The Russian capital's first direct mayoral elections in a decade will be held on September 8. REUTERS/Sergei Karpukhin (RUSSIA - Tags: BUSINESS POLITICS ELECTIONS HEADSHOT) 

Russian billionaire Mikhail Prokhorov speaks during a news conference, dedicated to addressing issues in the upcoming Moscow mayoral elections, in Moscow June 13, 2013. The Russian capital's first direct mayoral elections in a decade will be held on September 8. REUTERS/Sergei Karpukhin (RUSSIA - Tags: BUSINESS POLITICS ELECTIONS HEADSHOT) 

Brooklyn Nets owner Mikhail Prokhorov talks with the media about his decision to fire head coach Avery Johnson, at half time of their NBA basketball game with the Charlotte Bobcats in New York December 28, 2012. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT BASKETBALL) 

Brooklyn Nets owner Mikhail Prokhorov talks with the media about his decision to fire head coach Avery Johnson, at half time of their NBA basketball game with the Charlotte Bobcats in New York December 28, 2012. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT BASKETBALL) 

Brooklyn Nets owner Mikhail Prokhorov talks with the media about his decision to fire head coach Avery Johnson, at half time of their NBA basketball game with the Charlotte Bobcats in New York December 28, 2012. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT BASKETBALL) 

Brooklyn Nets owner Mikhail Prokhorov talks with the media about his decision to fire head coach Avery Johnson, at half time of their NBA basketball game with the Charlotte Bobcats in New York December 28, 2012. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT BASKETBALL) 

Brooklyn Nets owner Mikhail Prokhorov talks with the media about his decision to fire head coach Avery Johnson, at half time of their NBA basketball game with the Charlotte Bobcats in New York December 28, 2012. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT BASKETBALL) 

Brooklyn Nets owner Mikhail Prokhorov smiles during an interview before the Nets take on the Minnesota Timberwolves in their NBA basketball game in New York November 5, 2012. REUTERS/Adam Hunger (UNITED STATES - Tags: SPORT BASKETBALL HEADSHOT) 

NBA Brooklyn Nets' owner Mikhail Prokhorov (C) speaks with reporters after the ribbon cutting ceremony for the Barclays Center in the Brooklyn borough of New York September 21, 2012. The Frank Gehry designed Barclays Center is home to the Nets and will officially open with a concert by Brooklyn native Jay-Z on September 28. REUTERS/Brendan McDermid (UNITED STATES - Tags: SPORT BASKETBALL) 

Russian billionnaire Mikhail Prokhorov takes part in the St. Petersburg International Economic Forum in St. Petersburg, June 22, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: BUSINESS HEADSHOT) 

Russian billionnaire Mikhail Prokhorov speaks as he takes part in the St. Petersburg International Economic Forum in St. Petersburg, June 22, 2012. REUTERS/Sergei Karpukhin (RUSSIA - Tags: BUSINESS HEADSHOT) 

Billionaire tycoon and former presidential candidate Mikhail Prokhorov attends a news conference, dedicated to the announcement of his future political plans, in Moscow June 4, 2012. The portraits of current Russia's President Vladimir Putin (L, top), his counterparts from Belarus Alexander Lukashenko (L, bottom) and Kazakhstan Nursultan Nazarbayev (R, bottom) and Patriarch of Moscow and All Russia Kirill are on display in the background. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS BUSINESS) 

Billionaire tycoon and former presidential candidate Mikhail Prokhorov (C) attends a news conference, dedicated to the announcement of his future political plans, in Moscow June 4, 2012. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS BUSINESS) 

Billionaire tycoon and presidential candidate Mikhail Prokhorov speaks to the crowd during a protest demanding fair elections in central Moscow March 5, 2012. Thousands of protesters chanting "Russia without Putin" took to the streets of Moscow and St Petersburg on Monday to challenge Vladimir Putin's victory in a presidential election which international monitors said was unfair. REUTERS/Sergei Karpukhin (RUSSIA - Tags: POLITICS ELECTIONS CIVIL UNREST)

A screen displays preliminary results of Russia's presidential election during a news conference at the Central Election Commision in Moscow, March 5, 2012. Vladimir Putin faces new protests on Monday to challenge his victory in a presidential election he said had prevented Russia from falling into the hands of enemies trying to usurp power. The candidates are :(L-R) Vladimir Zhirinovsky of the Liberal Democratic Party of Russia, Communist leader Gennady Zyuganov, Sergei Mironov of the Just Russia party, independent candidate Mikhail Prokhorov, and United Russia party candidate Vladimir Putin. REUTERS/Thomas Peter (RUSSIA - Tags: ELECTIONS POLITICS) 

Russian billionaire and presidential candidate Mikhail Prokhorov speaks at his election campaign headquarter in Moscow March 4, 2012. Vladimir Putin won a resounding victory in Russia's presidential election on Sunday, exit polls showed, securing a new six-year term in the Kremlin and a mandate to deal with opposition protests after a vote that opponents said was marred by fraud. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS)

Russian billionaire and presidential candidate Mikhail Prokhorov speaks at his election campaign headquarter in Moscow March 4, 2012. Vladimir Putin won a resounding victory in Russia's presidential election on Sunday, exit polls showed, securing a new six-year term in the Kremlin and a mandate to deal with opposition protests after a vote that opponents said was marred by fraud. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS)

Russian billionaire and presidential candidate Mikhail Prokhorov speaks at his election campaign headquarter in Moscow March 4, 2012. Vladimir Putin won a resounding victory in Russia's presidential election on Sunday, exit polls showed, securing a new six-year term in the Kremlin and a mandate to deal with opposition protests after a vote that opponents said was marred by fraud. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS)

Russian billionaire and presidential candidate Mikhail Prokhorov speaks at his election campaign headquarter in Moscow March 4, 2012. Vladimir Putin won a resounding victory in Russia's presidential election on Sunday, exit polls showed, securing a new six-year term in the Kremlin and a mandate to deal with opposition protests after a vote that opponents said was marred by fraud. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS)

Members of a local electoral commission count ballots after emptying a ballot box, with ballots for presidential candidates Vladimir Putin (R) and Mikhail Prokhorov (2nd R) seen on the table, at a polling station in the village of Sliznevo outside Russia's Siberian city of Krasnoyarsk March 4, 2012. Vladimir Putin sought a convincing victory in Russia's presidential election on Sunday to strengthen his hand in dealing with the biggest protests of his 12-year rule, but faced allegations of widespread fraud. The sheets of paper read "V.V. Putin" (R) and "M.D. Prokhorov". REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS)

A member of the election commission holds a blank ballot paper listing presidential candidates at a polling station in Moscow March 4, 2012. Vladimir Putin is almost certain to win a third presidential term in an election that began on Sunday in Russia's far east, though opponents have challenged the legitimacy of a vote they say is skewed in his favor. List of Candidates reads (top-bottom) Vladimir Zhirinovsky of the Liberal Democratic Party of Russia, Communist leader Gennady Zyuganov, Sergei Mironov of the Just Russia party, independent candidate Mikhail Prokhorov, and United Russia party candidate Vladimir Putin. REUTERS/Anton Golubev (RUSSIA - Tags: ELECTIONS)

Russian billionaire and presidential candidate Mikhail Prokhorov leaves a voting booth during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Sergey Yatmasov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov looks at an election campaign book after casting his ballot during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov looks at an election campaign book after casting his ballot during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov gestures after casting his ballot during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov gestures after casting his ballot during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov casts his ballot during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov leaves a voting booth during presidential elections in the settlement of Pamyati 13 Bortsov outside Russia's Siberian city of Krasnoyarsk March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS BUSINESS) 

Russian billionaire and presidential candidate Mikhail Prokhorov smiles as he votes during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov receives his ballot during presidential elections in the settlement of Pamyati 13 Bortsov, outside Russia's Siberian city of Krasnoyarsk, March 4, 2012. REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov (2nd R) attends a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov attends a news conference before a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS HEADSHOT) 

Russian billionaire and presidential candidate Mikhail Prokhorov attends a news conference before a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Supporters of Russian billionaire and presidential candidate Mikhail Prokhorov attend a concert, part of the election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov addresses the audience during a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. The board reads "Candidate for President of the Russian Federation Mikhail Prokhorov". REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov addresses the audience during a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov walks on the stage during a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov addresses the audience during a concert, part of his election campaign, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. The board reads "Candidate for President of the Russian Federation Mikhail Prokhorov". REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

A presidential campaign poster for Russian billionaire Mikhail Prokhorov is on display, with the Russian White House, headquarters of the federal government, seen in the background, in Moscow March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. The boards read: "Mikhail Prokhorov. We demand utmost!" REUTERS/Sergei Karpukhin (RUSSIA - Tags: POLITICS ELECTIONS CITYSPACE) 

Cars drive past a presidential campaign poster for Russian billionaire Mikhail Prokhorov in St. Petersburg March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. The boards read: "Mikhail Prokhorov. We demand utmost". REUTERS/Alexander Demianchuk (RUSSIA) 

Cars drive past a presidential campaign poster for Russian billionaire Mikhail Prokhorov in St. Petersburg March 2, 2012. The upcoming Russian presidential elections are scheduled for March 4. The boards read: "Mikhail Prokhorov. We demand utmost". REUTERS/Alexander Demianchuk (RUSSIA - Tags: POLITICS ELECTIONS) 

A presidential campaign poster for Russian billionaire and presidential candidate Mikhail Prokhorov is on display in Krasnoyarsk March 2, 2012. Russians will go to the polls for their presidential election on March 4. The poster reads "Mikhail Prokhorov. New President - New Russia." REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

A presidential campaign poster for Russian billionaire and presidential candidate Mikhail Prokhorov is on display in Krasnoyarsk March 2, 2012. Russians will go to the polls for their presidential election on March 4. The poster reads "Mikhail Prokhorov. New President - New Russia." REUTERS/Ilya Naymushin (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov (C), surrounded by supporters, talks to the media at a railway station in St. Petersburg after travelling by Sapsan high speed train from Moscow in this February 10, 2012 file photo. Russians will go to the polls on March 4, 2012, to choose one of five candidates to be their new president. Picture taken February 10, 2012. REUTERS/Alexander Demianchuk (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian businessman and presidential candidate Mikhail Prokhorov speaks during a news conference in Moscow in this January 23, 2012 file photo. Russians will go to the polls on March 4, 2012, to choose one of five candidates to be their new president. Picture taken January 23, 2012. REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov (R) talks to his sister Irina Prokhorova during a news conference in Moscow February 28, 2012. Russians will go to the polls for their presidential election on March 4. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov speaks during a news conference in Moscow February 28, 2012. Russians will go to the polls for their presidential election on March 4. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov attends a news conference in Moscow February 28, 2012. Russians will go to the polls for their presidential election on March 4. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov speaks during a news conference in Moscow February 28, 2012. Russians will go to the polls for their presidential election on March 4. REUTERS/Anton Golubev (RUSSIA - Tags: POLITICS ELECTIONS TPX IMAGES OF THE DAY) 

Presidential candidates, Communist Party leader Gennady Zyuganov (R) and Fair Russia party leader Sergei Mironov, attend a news conference in Moscow February 27, 2012. Russians will go to the polls for their presidential election on March 4. Zyuganov is holding a paper which shows presidential candidates, Zyuganov (L-R), Liberal Democratic Party of Russia (LDPR) leader Vladimir Zhirinovsky, billionaire Mikhail Prokhorov, and Mironov. The headline reads: "God forbid!". REUTERS/Denis Sinyakov (RUSSIA - Tags: POLITICS ELECTIONS) 

Russian billionaire and presidential candidate Mikhail Prokhorov buys refreshments during a traditional Maslenitsa folk holiday celebration at the Bobrovy Log ski resort, in the suburbs of Russia's Siberian city of Krasnoyarsk, February 26, 2012. Russians will go to the polls for their presidential election on March 4. Maslenitsa is observed in Russia to celebrate the end of winter, and the welcoming of Spring. REUTERS/Ilya Naymushin (RUSSIA - Tags: ELECTIONS POLITICS)