London is home to many exiles and immigrants, including nouveau riche Russian capitalists who have run afoul of the ruling regime. Now a former spy's death has unnerved that boisterous and well-heeled community.

LONDON — Here in Moscow-on-the-Thames, it was a calling card from home.

An ex-KGB agent who has settled in London to raise his family gets a warning that his name is on a hit list, then falls ill from a mysterious poisoning and finally dies. Dark theories involving the Kremlin and sinister business figures tumble around town like blini from a hot pan.

Suddenly, the elegant Mayfair townhouses with window-box geraniums and the Chelsea gastro pubs with designer vodka don’t seem so very far from Russia.

The apparent attack on Alexander Litvinenko has reminded London’s 300,000-plus Russian residents that the long, often-menacing arm of Slavic capitalism and politics is only a 3 ½-hour Aeroflot flight away.

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“We are thinking about this and discussing this, but to tell you my opinion, it’s not just murder and poisoning — it’s politics,” said Elena Ragozhina, who edits “New Style,” a magazine for the New Russians of London.

“This kind of situation exists with all countries which started new to capitalism,” she said.

London has attracted exiles and immigrants from all over the world. The 21st century has belonged to Russians, many of them millionaires who brought their rapidly earned capital to the security, investment opportunity and favorable tax laws of England.

“In general, the main reason people come here is safety. And we see this place as much cleaner, with a higher standard of living,” said Dimitry Antonov, a native of Novosibirsk, in Siberia, who works for a Ukrainian oil and gas holding company in London.

Businessmen who never would leave home in Moscow without a team of bodyguards often go solo in London, he said. “It’s a little bit more civilized.”

Except when somebody eats a bowl of soup at a sushi restaurant at Picadilly Circus and winds up having poison as dessert.

Friends believe Litvinenko’s accusations of skulduggery against Russian authorities landed him in London’s University College Hospital. The Russian government has called suggestions that it was involved “nonsense,” and many commentators in Russia have pointed the finger at the tangled web of expatriate Russian politics in London.

A few Russian emigrés find solace not just in Britain’s tax laws, which allow their earnings to sit comfortably unnoticed offshore, but also in sympathetic political leaders who have resisted the attempts of the Russian government to extradite its opponents. Among them are the Chechen resistance’s foreign minister, Akhmad Zakayev, whom the Kremlin calls a terrorist, and billionaire Boris Berezovsky, wanted in Russia on fraud charges.

Berezovsky, under a grant of political asylum, has used London as a base for delving into countless political intrigues in Russia and neighboring Ukraine. He has bought up Russian newspapers, funded civil-rights organizations and generally made no secret of his intention to unseat President Vladimir Putin.

Litvinenko’s association with Berezovsky has fueled speculation about possible suspects and motives, the most convoluted of which centers on Berezovsky poisoning him to make Putin look bad.

Others view Berezovsky as the next potential target.