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 prince laid a floral wreath at one of a group of metal crosses near Wellington Arch in central London.
The group, which also owns Premier Inn, said on Wednesday that it will pursue a ‘demerger of Costa’.
The showers will become more frequent as the day goes on, giving some heavy downpours in places during the afternoon.