Killer of former Russian State Duma deputy Denis Voronenkov, Pavlo Parshov, who has earlier been dismissed from the Ukrainian National Guard, has visited Donetsk, while the law forbade him from doing so, Ukrainian Prosecutor General Yuriy Lutsenko said.

"We have identified the killer shot by a guard. He has earlier served as a Ukrainian Interior Ministry national guard. The criminal has stayed in the temporarily occupied territory on March 6, what is more, right in Donetsk. This gave the president and me a reason to assume that Russia is behind the crime. National guards, including former ones, are prohibited from staying in this area," Lutsenko said in an interview with Germany's Bild magazine published on Saturday.

"The murderer had some connections in the area currently outside Ukraine's control. I do not say that the killer has been a Russian agent. But he could have been such [...] during his service in the Ukrainian National Guard. When we detain his accomplices, we will find out more," he also said.

The prosecutor general recalled that the former Russian MP had planned to set up a center of resistance in Kyiv seeking to uncover corruption in the Russian Federal Security Service, and it could have been Russia's motive for eliminating him. "The matter was about drug trafficking. He said it publicly, either," Lutsenko said.

Voronenkov was assassinated "not because of testimony, which he had already given, but due to statements, which he should have issued," he said.

As reported, former State Duma deputy Voronenkov was killed in central Kyiv on March 23. The killer was injured by the former deputy's guard and died at hospital later. Pavlo Parshov was the killer, Ukrainian MP Anton Gerashchenko said.