The chief executive of Societe Generale's ( id="symbol_SOGN.PA_0"> SOGN.PA ) Russian unit was detained on Wednesday on suspicion of taking bribes, dealing a blow to one of the few foreign banks that has dared to challenge Russia's dominant state banks. The investigation into Rosbank Chief Executive Vladimir Golubkov in Moscow follows promises by President Vladimir Putin to crack down on corruption in business and public life as well as to defend national economic interests. It could also alarm international companies in Russia that are wary of the weak rule of law and the state's ability to step in against businesses or individuals that fall out of favor. Despite announcing cost cuts when it published results last week, the French bank reaffirmed its commitment to Russia, a market it entered at high cost in the past decade that has been abandoned by some Western banks. Those growth plans could now be at risk after Golubkov's detention on suspicion o