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Could the mysterious poisoning of an ex-Russian spy on the streets of an English cathedral city threaten England's participation at the 2018 World Cup in Russia?

Fox News contributor Nigel Farage said Prime Minister Theresa May has vowed to take action if the Kremlin is proven to be behind the poisoning and that step could be her only effective option.

"The difficulty is what can they actually do? The only sanction they've really got is they can withdraw our soccer team from the World Cup finals taking place in Russia this summer," he said on "America's Newsroom."

Police have cordoned off a series of sites after Skripal, 66, and his 33-year-old daughter, Yulia, were found unconscious on a bench in Salisbury on Sunday. The pair are in critical condition in a local hospital.

Skripal, a former Russian military intelligence officer, was convicted in his home country in 2006 of spying for Britain and released in 2010 as part of a spy swap. He had been living quietly in Salisbury, a city of about 40,000 people 90 miles southwest of London.

Farage said the attack with a nerve agent, which also sickened a police officer and 18 others who were exposed, appears to be a message from Vladimir Putin to traitors.

"Russians do not look kindly upon traitors. ... If it is the Russians doing it, it sends a message doesn't it? If you think you can give away our state secrets and live somewhere else for the rest of your life, you will never, ever be safe. That is probably the motive behind this," said the former Brexit leader. 

In 2006, Russian FSB defector Alexander Litvinenko was murdered in London after radioactive polonium-210 was slipped into his tea. 

Watch the interview above.

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