Russian political scientist Vyacheslav Nikonov has described how he learnt of his invitation to a meeting with US intelligence whistleblower Edward Snowden.
He also told Reuters: "I was not in the position to reject..it's intriguing."
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The full list of winners of the 89th Academy Awards in Hollywood.
The Oscars was plunged into chaos as La La land was mistakenly announced as the best picture, the actual winner was Moonlight.
The tourists had no idea they were about to be dropped off at the star-studded ceremony to meet A-listers.