A Russian general was killed Monday morning after an explosive device detonated underneath his car in Moscow, and investigators said Ukraine could be behind the attack, the third such killing of a senior military officer in a year.

Lt. Gen. Fanil Sarvarov, head of the Operational Training Directorate of the Russian Armed Forces` General Staff, died from his injuries, said Svetlana Petrenko, the spokesperson for Russia`s Investigative Committee, the nation`s top criminal investigation agency.