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Donetsk, Ukraine (CNN) - A leader of pro-Russian rebels in eastern Ukraine resigned his post Thursday as fighting flared there, with militants reportedly downing a Ukrainian military plane as Ukrainian government forces continued their attempt to retake the key city of Donetsk.
Alexander Borodai, prime minister of the self-proclaimed Donetsk People's Republic, told reporters in the city he was stepping down Thursday and handing power to Alexander Zakharchenko, a little-known militia commander.