Russia's migration service has provided fugitive US intelligence leaker Edward Snowden with a document that allows him to leave the Moscow airport transit zone where he has been holed up for the last month, the RIA Novosti news agency said Wednesday.

The document confirms that his application for asylum is being considered but allows Snowden to cross the Russian border so long as border guards do not object, it said. The Interfax news agency said Snowden could leave the airport in the "next hours".

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