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Planes leave Moscow and Kiev in Russia-Ukraine prisoner swap

MOSCOW/KIEV, Sept 7 (Reuters) - A plane with Ukrainian markings has taken off from Moscow's Vnukovo airport on its way to Kiev as part of a prisoner swap operation, a Reuters witness and Russian news agencies reported.

At the same time, a Russian plane left Kiev's Borispol airport, a Reuters witness and Ukrainian officials said. (Reporting by Anton Zverev and Natalia Zinets; writing by Polina Devitt; editing by Alexander Smith)