The BBC World Service has reported on two Russian men, identified by pseudonyms Ivan and Foma, who claim to be secretly working for Ukraine's military intelligence (GUR) to conduct sabotage operations against Russian military assets and personnel. Ivan claims involvement in drone attacks on strategic bombers and munitions factories, while Foma, operating from Poland, runs a network of volunteers in Russia to surveil high-level officers. The GUR has confirmed both men are working for the agency, though it cannot fully verify their claims. Foma admitted to providing intelligence on Lt Gen Fanil Sarvarov, who was assassinated in Moscow in December last year.