Russia has arrested four people on suspicion of plotting to assassinate senior defence officials and their families on Ukraine’s orders, the Kremlin’s Federal Security Service (FSB) said.

Lieutenant General Igor Kirillov, head of Russia’s Nuclear, Biological, Chemical Defence Forces (NBC), was killed in an explosion in Moscow in an assassination claimed by Ukraine

Russia's Federal Security Service (FSB) has detained four Russians who allegedly were preparing a series of terrorist attacks against high-ranking Defense Ministry officials and their families, the agency's press service said on Dec.

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.

The bombs were disguised as an electric scooter, a document folder and a magnetized portable charger, Russia's Federal Security Service said.

Four Russians were arrested for allegedly helping Ukraine’s SBU plan the assassinations. Read more at straitstimes.com.