The 68-year-old's body was discovered by his family and friends late on Monday night.
A lawyer says a Russian businessman who associated with a prominent critic of the Kremlin has died in London.
In 2010 Glushkov was granted asylum in the United Kingdom and moved to London.
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Mr Berezovsky, who became Mr Putin's most strident critic from overseas, was found dead in 2013 - police concluded it was suicide but a coroner recorded an open verdict.
Glushkov was sentenced in 2004 by the Savelovsky Court of Moscow to three years and three months in prison and released for time served, Russian news agency Tass reported.
The Metropolitan police also said that "the death is now being treated as an unexplained", while "there is no evidence to suggest a link to the incident in Salisbury". Last year, a Moscow court tried him in absentia for embezzlement from Aeroflot, the Russian court-reporting agency RAPSI reported. They remain in a critical but stable condition. Mr Berezovsky lost the £3.2bn claim and was found by a judge to have been "deliberately dishonest".
The idea that the oligarch and self-appointed chief nemesis of Vladimir Putin had committed suicide was, he insisted, "bullshit" "I will never accept the idea", he said after coroners recorded an open verdict in his fellow exile's death in Berkshire in 2013.
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"I'm definite Boris was killed", he said. "I have quite different information from what is being published in the media". "Too many deaths [of Russian exiles] have been happening", Glushkov said at the time.
"Boris was strangled. Either he did it himself or with the help of someone". The Metropolitan Police says that its counter-terrorism unit is handling the case "because of associations that the man is believed to have had".
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The Russian embassy said it had sought Mr Glushkov's extradition in 2015 "for committing a number of severe financial offences on the territory of Russia", but the British government refused.
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Reacting to the development and the criticism that trailed the president's comment, the presidential spokesman said the alleged disobedience is yet to be confirmed.