Russian and British executives in this bad marriage have been in turmoil since 2011, with AAR accusing BP of treating TNK-BP merely as a Russian subsidiary to boost its reserves, and not letting the company expand abroad in areas where it might itself compete with BP.

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The BBC Moscow correspondent says many in Russian politics believe Mr Yeltsin's health is now so bad that he should retire.

BBC: News | Europe | Yeltsin rushed to hospital

Acevedo was initially taken to a prison camp known as Stalag IX-B in Bad Orb, Germany, where thousands of American, French, Italian and Russian soldiers were held as prisoners of war.

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This is mainly a legacy of Soviet mistrust, coupled with the very bad reputation that charities connected to military ex-servicemen, the Russian Orthodox church and sport gained in the immediate post-Soviet period.

ECONOMIST: Russia

More scrutiny has become the norm in Russian mergers and acquisitions, because no one wants to buy a company that is later fingered for having bad behavior the past.

WSJ: Welcome (Back) to Russia