Russian associate of late tycoon Berezovsky found dead in Britain

British counter-terrorism police were on Tuesday investigating the unexplained death of a Russian associate of late tycoon Boris Berezovsky but said the death was not thought to be linked to a nerve agent attack on a former Russian double agent.Nikolai Glushkov, 68, was discovered dead late on Monday at an address in Clarence Avenue in suburban south-west London.British police, who did not name Glushkov, said that they were investigating the death of a man in his 60s who lived on Clarence Avenue