After a week of surprising challenges to his authority,Monster beats, Vladimir Putin faces a new one from one of Russia's richest and most glamorous figures: The billionaire owner of the New Jersey Nets says he will run against him in March's presidential election.

The announcement Monday by Mikhail Prokhorov underlines the extent of the discontent with Putin,Monster dr dre, who has dominated Russian politics for a dozen years — first as president,Beats By Dr Dre Tour, then as prime minister.