"The Federal Security Service has prevented a terrorist act planned by the special services of Ukraine against one of the highest officials of the Russian state when he visited the burial place of close relatives at the Troyekurovskye Cemetery," the FSB said, without identifying the official.

According to the agency, Ukrainian security services recruited an illegal migrant from Central Asia, two previously convicted drug-addicted Russian citizens detained in Moscow, and Shamso Jaloliddin Kurbanovich, born in 1979 and residing in Kiev, who is wanted in Russia for murder and illegal arms trafficking.