The British embassy in Moscow has warned of the damage being done by the dispute between TNK-BP's shareholders.
The oil company is half-owned by BP, with the other half owned by a group of Russian billionaires known as AAR.
The embassy said that their spat was damaging the economies of both Britain and Russia as well as harming the global energy market.
It also accused AAR's members of using parts of the Russian government to help them TNK-BP chief leaves Russia ...
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German FM Steinmeier starts five-day visit to Russia ... in their fight with BP.
The embassy alleges that the shareholders have managed to get various elements of the Russian government involved on their side, according to the BBC's Moscow correspondent Richard Galpin.
But the Russian shareholders deny they want control of TNK-BP.
Visa rows
They insist their only goal is to remove Robert Dudley as chief executive of TNK-BP because they say he's not running the company in the interests of all those involved.
On Thursday Mr Dudley, said he was temporarily leaving Russia because of "sustained harassment".
This year TNK-BP has faced lawsuits, visa rows and industrial spying claims, as well as arguments about investment and the future role of Mr Dudley.
BP has withdrawn 150 of its foreign specialists from the country.
The Russian shareholders said the claims of harassment were "insulting", but still want Mr Dudley replaced because they claim that he is only running the joint venture in the interests of BP.
Another businessman who has had problems doing business in Russia is Bill Browder from Hermitage Capital.
He was barred from the country three years ago having become the biggest foreign investor in Russia.
He told the BBC that the high asset prices in Russia combined with the sort of problems BP is having makes Russia a bad place to invest at the moment.
"At this point you have no rule of law, no property rights and the prices are high - that's kind of a sucker's bet," he said.
(BBC)
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