The wife of jailed former oil tycoon Mikhail Khodorkovsky says she has not yet received confirmation of her husband\'s whereabouts after he was moved from a detention center in the central Russian city of Vologda earlier this week. Once Russia\'s richest man, Khodorkovsky is serving a 13-year jail sentence on charges of embezzlement and tax fraud. \"Neither Khodorkovsky\'s relatives, nor his lawyers have received official information about which prison he has been transferred to,\" the former businessman\'s lawyer Natalia Terekhova said. \"We requested this information from the pre-trail detention center and were told that they sent a notification on the transfer of the former Yukos head on June 14.\" The Russian media reported on Wednesday that Khodorkovsky had been transferred to a prison in the sparsely populated Karelia region close to Russia\'s border with Finland. The former head of the now defunct Yukos oil company served out the first part of his sentence in eastern Siberia, but was moved to a pre-trial detention center in Moscow late last year to undergo a second trial and subsequent appeal hearing. He was transferred to Vologda on June 10.