Russia's Prime Minister says Ukraine's interim government came to power in an "armed mutiny".
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Dmitry Medvedev says he questions the legitimacy of the new rulers – and Western support for them.
It comes as an arrest warrant has been issued for ousted president Viktor Yanukovych – as Ukraine begins to investigate the deaths of protesters in a week of carnage in Kiev.
Yanukovych left the capital at the weekend – he's reportedly been spotted in the Crimea region.
