Russian officials have asked Norilsk Nickel to explain transactions that have raised minority investor concerns about corporate governance and cost the company more than $3bn since the summer, people close to the shareholders said on Tuesday.
The nickel miner confirmed it had received the request but said such requests were part of the usual exchange of correspondence between the government and the company. It said it had provided exhaustive answers several weeks ago. It declined to give details on the questions asked. A government spokesman declined to comment.

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