Anton Gerashchenko, an adviser to Ukraine's interior minister, identified the man who shot Voronenkov yesterday as 28-year-old Pavel Parshov and said he had been trained in Russia by Russian security services. He was killed in the attack.
"He underwent a special course at a school for saboteurs," Gerashchenko wrote today in a Facebook post.
Dmitry Peskov, a spokesman for Russian President Vladimir Putin, told reporters that Gerashchenko's allegation was "absurd."
Voronenkov, a former Russian lawmaker who became a vociferous critic of Moscow following his recent move to Ukraine, was shot dead near the entrance to an upscale hotel in the center of Kiev.
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Both men were scheduled to give testimony yesterday at Ukraine's Military Prosecutor's Office. The purpose of the testimony was not immediately clear.
Ukrainian media today published leaked CCTV footage of the attack. It shows the killer shooting Voronenkov from behind as he was walking down the street with his bodyguard.
When the bodyguard tries to intervene, he, too, is shot, leaving the killer free to shoot Voronenkov again as he is lying on the floor. The injured bodyguard then pulls out his gun and, while lying on the floor, opens fire on the killer, who died later in the hospital.