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A suspect has been arrested on suspicion of murdering top Russian general Igor Kirillov, who died along with his assistant when a bomb planted on a scooter exploded outside his home in Moscow on Tuesday.

The FSB, Russia’s main security service, said on Wednesday it had arrested an Uzbek man who planted the bomb on the scooter and then detonated it remotely.

It added that the suspect had planted a camera in a rental car to film the bombing.

The FSB released a video of the suspect saying he bought the scooter several months in advance.

The suspect said in the video that Ukrainian intelligence offered him $100,000 and a “European passport” to carry out the attack.

Kirillov, the head of the military’s nuclear, chemical and biological defense forces, is the top Russian official assassinated since President Vladimir Putin ordered the all-out invasion of Ukraine in 2022.

The bombing is the most brazen in a series of assassinations of senior Russian officers carried out deep behind enemy lines.

Putin has not commented on the attack.

Dmitry Medvedev, a former Putin deputy who is now his deputy on the Russian Security Council, called on security officials to “destroy the people behind it in Kiev.”

Kirillov was hit with British sanctions in October “over the use of barbaric chemical weapons in Ukraine,” including the toxic asphyxiant chloropicrin.

The SBU, one of Ukraine’s security services, issued a “notice of suspicion” – essentially an arrest warrant – against Kirillov a day before the attack for alleged “war crimes” against Kiev’s forces using chemical weapons.

Kirillov was also known for public briefings in which he accused Ukraine of planning to use chemical weapons and use U.S.-developed drones carrying “infected mosquitoes” to spread malaria among Russian forces.