There are many facts showing that Putin's people enriched themselves by using power mechanisms so that's why for them losing power means losing their fortunes.
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About Garry Kasparov
Garry Kasparov was a contemporary Russian chess grandmaster. Garry Kimovich Kasparov is a Russian chess grandmaster, political activist and writer, who was the World Chess Champion from 1985 to 2000. His peak FIDE chess rating of 2851, achieved in 1999, was the highest recorded until being surpassed by Magnus Carlsen in 2013. Read more on Wikipedia →