The suspect according to a statement on Wednesday by Russia's Investigative Committee, which probes serious crimes, said the suspect had confessed to planting a bomb which killed Kirillov on the instructions of Ukraine's security service.
An Uzbekistan citizen has been detained for the assassination of Lieutenant General Igor Kirillov at the early hours of Tuesday in his residence in Moscow, Russian authorities have said.
The suspect according to a statement on Wednesday by Russia's Investigative Committee, which probes serious crimes, said the suspect had confessed to planting a bomb which killed Kirillov on the instructions of Ukraine's security service.
SaharaReporters reported on Tuesday that Kirillov, who was chief of Russia's Nuclear, Biological and Chemical Protection Troops, was killed outside his apartment building along with his assistant when a bomb hidden in an electric scooter went off.
He was the most senior Russian military officer to be assassinated inside Russia by Ukraine. Ukraine's SBU intelligence service, which accused Kirillov of being responsible for the use of chemical weapons against Ukrainian troops, something Moscow denies, took responsibility for the killing.
However, in the statement the investigative committee explained that suspect, whose identity hasn't been revealed confessed during interrogation that he had come to Moscow where he had received an improvised explosive device for the hit.
The statement said he had described how he had placed the device on an electric scooter which he had parked outside the entrance of the apartment block where Kirillov lived.
Investigators cited him as saying that he had set up a surveillance camera in a hire car nearby and that the organisers of the assassination, who he said had been based in the Ukrainian city of Dnipro, had used the camera to track Kirillov and remotely detonated the device when he had left the building.
According to the statement the suspect born in 1995, had been offered $100,000 for his role in the murder and residency in a European country.
Investigators said they were identifying other people involved in the hit and the daily Kommersant newspaper reported that one other suspect had been detained.