The opposition activist eyes support for aspiring local councillors
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Police have accused Khodorkovsky of being involved in a contract killing in 1998.
A spokeswoman for the former Yukos boss has said the case is a "farce".
The former Yukos boss says he won't comply with the Kremlin's request to question him.
The former oligarch's spokeswoman has called the request a farce.
The conflict centers around Russia's refusal to pay $50 billion to the shareholders of the now-defunct oil company.
Alexei Navalny and Mikhail Khodorkovsky will join forces next month in a protest against "the current regime".
Alexei Navalny was sentenced to house arrest, while his brother has been sent to jail for embezzlement charges