Source: BBC NewsOleksandr Muzychko, better known as Sashko Bily, died in a shoot-out with police in a cafe in Rivne in western Ukraine, the interior ministry said.
He was a leader of Right Sector, a far-right group which was prominent in the recent anti-government protests.
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A Right Sector organiser in Rivne has now threatened revenge for the killing of Muzychko, saying he had not been summoned by investigators.
"We will avenge ourselves on [Interior Minister] Arsen Avakov for the death of our brother. The shooting of Sashko Bily is a contract killing ordered by the minister," said Roman Koval of the Right Sector in Rivne region, quoted by the Ukrayinska Pravda website.
The government is apparently claiming he committed suicide, though the Right Sector founder Dmytro Yarosh is having none of that and calling for the Interior Minister to resign and the police units involved to be arrested. Apparently, in the face of all the threats of retaliation, Avakov has decided to crack down on the group and is reportedly planning to clear the Maidan of the group. Of course, the last person who tried to clear protesters out of the Maidan did not have that venture end well for him. The fractures are beginning to show with the Maidan revolutionaries as Klitshcko is now looking for a vote to unseat the acting president.