Kirillov, who has been killed in Moscow, was accused by the West of overseeing the use of chemical weapons on the battlefield in Ukraine.

Russia said on Wednesday it had detained an Uzbek man who had confessed to planting and detonating a bomb which killed a top general, Igor Kirillov, in Moscow on the instructions of Ukraine's SBU security service.

Kirillov ran Russia’s nuclear, biological and chemical defense forces. Kyiv previously accused him of ordering the use of chemical weapons against Ukraine.

Igor Kirillov, a general in charge of Russia’s military’s nuclear and chemical weapons protection forces, was killed on Tuesday by a bomb in Moscow, the Russian authorities said.

Kirillov, who was chief of Russia ’s nuclear, biological and chemical protection troops, was killed outside his apartment building on Tuesday along with his assistant when a bomb hidden in an electric scooter went off. He is the most senior Russian military officer to be assassinated in Russia by Ukraine.

Russia has detained a citizen of Uzbekistan who it says has confessed to planting the bomb that killed Lieutenant General Igor Kirillov in Moscow.

Russia has detained two suspects in the murder of Lieutenant General Igor Kirillov, Head of the Radiation, Chemical and Biological Protection Troops of the Russian Armed Forces, the Russian newspaper Kommersant reports.

FSB unveils footage of a suspect's arrest linked to the assassination of Lt. Gen. Igor Kirillov, revealing details of the covert operation.- Watch Video on English Oneindia

Russia said the suspect, a Uzbekistan national, had been recruited by Ukrainian security services to carry out the assassination.