Moscow has turned to riskier methods of espionage after expulsion of spies it had placed under diplomatic cover in Europe
An Argentinian couple living in Slovenia, a Mexican-Greek photographer who ran a yarn shop in Athens and now three Bulgarians arrested in Britain. Over the past year, police and security services across the globe have accused numerous people living apparently innocuous lives with being Russian intelligence agents or operatives.
Many others have been accused of passing information to Russia, including a security guard at the British embassy in Berlin, sentenced to 13 years in prison, and more than a dozen people arrested in Poland accused of carrying out various tasks for Russian intelligence.
