The arrest announcement follows the death of Russia's Lt. Gen Igor Kirillov, who was killed on Dec. 17 by a bomb hidden on an electric scooter parked outside his apartment building.

MOSCOW (AP) — Russia's top security agency said Thursday that it has arrested several suspects accused of involvement in an alleged Ukrainian plot to assassinate senior military officers, an announcement that follows the killing of a top Russian general last week.

The Federal Security Service of Russia said a series of assassination attempts had been foiled. Four Russian citizens have been arrested.

Russia’s Federal Security Service (FSB) said it thwarted multiple assassination plots allegedly orchestrated by Ukrainian intelligence and carried out by Russian citizens recruited to execute the attacks,