The explosion that killed Lieutenant General Igor Kirillov, the head of the Radiation, Chemical and Biological Protection Troops of the Russian Armed Forces, was a special operation by the Security Service of Ukraine, said the Ukrainska Pravda source in the Ukrainian security services, reports Ukrainska Pravda.

The source reported that a scooter carrying explosives was detonated when Kirillov and his aide were entering a building in Moscow. Both were killed, the source said.