Spokesperson for the president Sviatoslav Tseholko quoted Poroshenko as saying, Censor.NET reports.
"The treacherous murder of Denys Voronenkov in downtown Kyiv is an act of state-sponsored terrorism committed by Russia, the country which he was forced to leave for political reasons. It is a clear signature of the Russian secret services that has been repeatedly seen in various European capitals," the president said.
Poroshenko said Voronenkov was one of the main witnesses in the case of the aggression launched by Russia against Ukraine and testified about the part Yanukovych played in bringing the Russian troops in Ukraine.
The head of state said it was no coincidence that the murder and explosions in Balakliia took place on the same day.
As reported, former Deputy of the State Duma of the Russian Federation Denys Voronenkov was shot dead in downtown Kyiv. The hitman also managed to injure Voronenkov's bodyguard. The incident took place outside Kyiv's Premier Palace Hotel.
Denys Voronenkov and Ilya Ponomarev, both former deputies of the State Duma of the Russian Federation, gave testimonies to the Prosecutor General's Office of Ukraine in the case of Viktor Yanukovich's treason. According to the PGO, the law provides for entering to the case file the transcript of Voronenkov's testimony signed by him.
Ilya Ponomarev earlier said that Voronenkov was murdered in downtown Kyiv on his way to the meeting with him.