Nikolai Glushkov - who was granted political asylum in the United Kingdom in 2010 - was a former friend and business associate of the late Russian tycoon and Kremlin critic, Boris Berezovsky, whose body was found by an employee in the locked bathroom of his luxury London home in 2013.
They added that there was "nothing to suggest any link" to the attempted assassination of ex-spy Sergei Skripal in Salisbury, who is the subject of a diplomatic dispute between Moscow and London.
Counter-terrorism police are investigating the death of Mr Glushkov, who was found at his home in south-west London on Monday.
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Mr Glushkov worked for Mr Berezovsky's LogoVaz vehicle company in Russian Federation, before becoming the first deputy general director for Russia's flag carrier Aeroflot in the late 1990s.
It comes at a time when United Kingdom and Russian relations have sunk to fresh lows after the use of a nerve agent on United Kingdom soil against a former Russian spy who had previously passed information to Britain, which several world powers have blamed Russia for.
His family feared he might have been murdered by enemies in Russian Federation, but British police and forensic experts concluded that Berezovsky had committed suicide.
The retired Russian executive was found dead on Monday evening at his home in southwest London, where he had lived for two years.
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"As a precaution, the command is retaining primacy for the investigation because of the associations Mr Glushkov is believed to have had".
He was found by police to have strangled himself five years ago at his home in Sunninghill, Berkshire, but later a coroner issued an open verdict on his death. In 2000, he was arrested over the embezzlement of Aeroflot's funds, and later charged with fraud and money laundering.
Last year, he was sentenced to eight years imprisonment and a 1 million ruble fine in absentia for allegedly defrauding Aeroflot - a case that continued at the time of his death.
Russian media reported that Glushkov was granted political asylum in Britain in 2010.
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But they also did not want to submit a guilty plea while the death penalty remained a possibility, he said. Peterson stays across from building 12, which is out of view, just to the left of the pavement.