From The Times (UK):
Yelena Bonner, one of the most famous dissidents from the Soviet era, said yesterday that modern Russia had returned to the practices used by the former Soviet KGB.
“I think the KGB, or the FSB as it is known, killed him,” said Mrs Bonner, the widow of Andrei Sakharov the most famous Soviet dissident of his time.
“The present Russian power structure draws on the experiences it learned from Soviet operations in the past,” she told The Times.
She said that she had met Litvinenko in London two years and was planning to meet his widow Marina to commiserate over the death of her husband.