ISTANBUL Three Bulgarian nationals have been convicted by a London jury for espionage on behalf of Russia, marking one of the UK's largest foreign intelligence operations in recent years, according to media reports Friday. Katrin Ivanova, 43, Vanya Gaberova, 30 and Tihomir Ivanchev, 39, were found guilty of conspiracy to spy at London's Old Bailey, The Guardian newspaper reported. The trio, who lived in London, were part of a spy ring that operated across Europe from 2020 to 2023, targeting