Colonel Sergei Olegovich Tretyakov (Russian: Сергей Олегович Третьяков; 5 October 1956 – 13 June 2010) was a Russian SVR (foreign intelligence) officer, who...

(1892–1937), Russian writer Sergei Tretyakov (intelligence officer) (1956–2010), Russian who defected to the United States Sergei Tretyakov (scientist), Russian-Finnish...

(1892–1937), Russian writer Sergei Tretyakov (intelligence officer) (1956–2010), Russian spy and defector Sergei Tretyakov (scientist), Russian-Finnish...

diplomats and other tasks. According to senior SVR officer Sergei Tretyakov, he often sent intelligence officers to branches of the New York Public Library where...

Russian volleyball player Sergei Tretyakov (intelligence officer), Russian SVR defector Sergey Usenya, Belarusian footballer Sergei Ivanovich Vasiliev (born...

former SVR defector Sergei Tretyakov, in the 1990s, SVR agents were secretly scattered across New York City to gather intelligence for the Kremlin in Russia...

in the KGB's disinformation factories." According to senior SVR officer Sergei Tretyakov, the KGB had been responsible for creating the entire nuclear winter...

"hugely successful campaign and well worth the cost". The former KGB officer Sergei Tretyakov said that the Soviet Peace Committee funded and organized demonstrations...

of the prisoners' swap, the death of the prominent Russian defector Sergei Tretyakov, who died in the US on June 13, 2010, was reported on July 9, 2010...

organised and financed western peace movements; for example, ex-KGB agent Sergei Tretyakov claimed that in the early 1980s the KGB wanted to prevent the United...