Berezovskys death is one of several incidents raising fears about Russian activity in the UK

FILE – In this Feb. 2006 file photo Georgian oligarch Badri Patarkatsishvili smiles in Tbilisi. Russia’s transition from a Kremlin-controlled economy to a free market in the 1990s brought on a wave of contract killings as criminals, entrepreneurs, and corrupt officials tried muscle each other out of lucrative businesses. The recent death of 67-year old Boris Berezovsky, which remains unexplained, has revived fears that the assassins that have long stalked oligarchs and opposition figures back in Russia have been making their home in the U.K. Patarkatsishvili, an associate and confidant o…

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