Members of the media have gathered at Moscow's Sheremteyevo Airport ahead of Edward Snowden's meeting with human rights groups.
The former CIA analyst has requested the meeting to discuss the "next steps forward" after accusing the United States of preventing him from taking up offers of asylum.
Washington is seeking to prosecute Mr Snowden for leaking secret documents and have criticised China's failure to extradite him.
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More than 80 prominent Britons, including Boris Johnson, Russell Brand and former Government ministers, urge Obama to release Aamer.
Thundery overnight with a Met Office warning for rain in place for a large swathe of the country. Quite sunny throughout tomorrow.
Video shot in Islamic State capital Raqq purportedly shows at least two of three missing London schoolgirls.