AN EX-KGB spymaster who subjected the British secret service to its worst embarrassment since the Cold War is the right-hand man of Lord Mandelson's controversial Russian friend Oleg Deripaska, the Evening Standard discloses today. Valery Pechenkin was a high-ranking officer in the KGB and a Colonel-General in its successor, the FSB. He is employed as head of security at Deripaska's company Basic Element, but the part he plays in Deripaska's affairs goes far beyond the role suggested by his job title. According to well-placed sources in Moscow, Pechenkin is one of Deripaska's strongest links to the Kremlin. The veteran spy...