Berezovsky sued Abramovich, owner of Chelsea Football Club, for $5.1 billion, alleging that he was forced to sell his stake in the Russian oil company Sibneft for a fraction of its true value.
The judge called Berezovsky's testimony unreliable and, at points, dishonest.
Analysts put the price tag for legal fees alone at more than $250 million spent between the two sides, which Berezovsky was ordered to pay.
Berezovsky was this year reported to be in serious financial difficulties; last week he sold an Andy Warhol screen print entitled "Red Lenin" for $200,000 and the mansion where he died was reported to be owned by his ex-wife.
As speculation swirled about the cause of his death, Damian Kudriavtsev, a friend of Berezovsky, said Sunday that his friend was unhappy and was in financial trouble, but wouldn't have harmed himself.
Berezovsky, he said, had always hoped to return to Russia someday.
About two months ago, he sent a letter to Putin asking permission to return to Russia, Putin spokesman Dmitry Peskov said. "He admitted that he had made a lot of mistakes, asked forgiveness for the mistakes and asked Putin to let him return home," Peskov said, according to a duty officer with the presidential press service.
It's unknown whether Putin responded to the letter, but Berezovsky did not return.