LONDON (AP) -- Russian tycoon Roman Abramovich has won a multibillion-dollar legal battle against another Russian oligarch in a London courtroom.

Judge Elizabeth Gloster ruled that the 45-year-old Abramovich was the more reliable witness in his long-running feud with the 66-year-old self-exiled tycoon Boris Berezovsky.

Berezovsky, a former Kremlin power broker, alleged that Abramovich, who he called his protege, betrayed and intimidated him into selling his stakes in the Russian oil company Sibneft vastly beneath their value.

Berezovsky alleged blackmail and breach of contract and was seeking more than 3 billion pounds ($4.8 billion) in damages.

Abramovich had denied the allegations.