The FSB said the suspected organisers of the attacks were planning to kill a senior defence official using a remotely controlled car bomb.

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 Russian prosecutor’s office said the suspect, a 29-year-old citizen of Uzbekistan, confessed to planting the bomb on the orders of Ukrainian agents.

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

Russia’s security service says it has detained a citizen from Uzbekistan in the bombing that killed a senior general as he left his Moscow apartment.