A British man who claims he was married to alleged Russian spy Anna Chapman has been speaking about their relationship.
Alex Chapman told the Daily Telegraph he met Ms Chapman at a London party and married her five months later in 2002.
He said he was "not surprised" by the arrest; his former wife said her father had once been high up in the KGB.
Ten alleged members of a Russian spy ring were arrested in the US and one in Cyprus after an FBI inquiry. Bail hearings are currently taking place.
They were charged with conspiracy to act as unlawful agents of a foreign government, a crime which carries up to five years in prison.
Publicist Max Clifford said Mr Chapman, who was married to Ms Chapman for four years, said his former wife had become "increasingly distant" and "increasingly secretive" as their marriage progressed.
Film premieres
"The relationship changed and she became more and more distant, and spent more of her time mixing with the very rich and powerful people, going to film premieres," Mr Clifford told the BBC.
He said Mr Chapman had told him his former wife's father, Russian diplomat Vasily Kushchenko, had had a "huge influence" on her.
"The inference is her father was at the heart of everything that she did, so therefore the person that, if you like, was arranging the invitations, was making the contacts, would have been directly or indirectly through her father," Mr Clifford said.
In the interview with the Daily Telegraph, Mr Chapman, 30, from Bournemouth, Dorset, said he had first met her father on the couple's honeymoon in Zimbabwe in 2002, where Mr Kushchenko was serving as a diplomat.
"I asked her what her father's job was and Anna just said he was there to represent the Russian government in certain areas of government.
"He didn't trust anyone. He asked me why I had chosen a Russian bride and asked what business I had in Russia, and I said none.
"He was scary. He would never introduce me to other Russian people who came to the house and he always seemed to have a lot more security than the other diplomats," he said.
He also told the paper: "Anna told me her father had been high up in the ranks of the KGB. She said he had been an agent in 'old Russia'.
"When I saw that she had been arrested on suspicion of spying it didn't come as much of a surprise to be honest".
Mr Chapman, who has remained friends with his former wife, was questioned by MI5 on Wednesday about his relationship with her.
The BBC's security correspondent Gordon Corera said MI5 and the FBI were in talks and the "key question" was whether Anna Chapman had been active as an undercover Russian agent in the UK.
"It sounds as if after becoming married she then began to change and began to take on a secret life.
"Which does suggest she may have been active in some way or at least preparing to become active while she was in Britain.
"If she was spying here, they might be able to find out who she was working with, what secrets she might have got," he said.
Ms Chapman, 28, worked in the financial sector for a few years after moving to London in 2002.
According to the Telegraph, she moved back to Russia when her marriage ended in 2006, before moving to the US where she established an online property venture.
Ms Chapman had her bail request denied by a US court on Monday.
Prosecutors say one of her co-accused has confessed to being an agent for the Kremlin. The suspect, who called himself Juan Lazaro, has admitted that was not his real name.
The Foreign Office said it was looking into Anna Chapman's links to Britain.
