MOSC OW (Reuters) - Russian billionaire and British media magnate Alexander Lebedev is being investigated for throwing a punch at a fellow entrepreneur on a prime time television talk show, prosecutors said Tuesday. Prosecutors said in an online statement that the case was opened after an initial investigation found Lebedev had inflicted bodily harm on property developer Sergei Polonsky, himself a one-time billionaire who lost part of his fortune during the economic crisis. Lebedev, the owner of Britains The Independent and London Evening Standard newspapers, faces up to five years imprisonment under the criminal charges.