(Reuters) – The wife of one of Russian President Vladimir Putin’s top allies in Ukraine said on Friday that he has been beaten by the Ukrainian security service while being interrogated in detention. At a news conference in Moscow, Viktor Medvedchuk’s wife Oksana Marchenko said that one of two photos released by Ukraine this week showed he had been beaten. Reuters could not independently confirm this, and neither Ukraine’s security service, the SBU, nor the Kremlin immediately responded to requests for comment. On Wednesday, Dmitry Medvedev, deputy chairman of Russia’s Security Council, said: …