Expert: 'No question US got better of spy deal'
Ten Russian spies have been flown back to Moscow from the US, after they pleaded guilty to conspiracy.
Meanwhile, the four Russians freed by the Kremlin in exchange were collected by a US plane at Vienna airport.
Philip Davies, Director of Brunel University's Centre for Intelligence and Security Studies, and the author of 'MI6 and the Machinery of Spying' told BBC News he though the US had got much the better of the deal.
