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"Ukrainian law enforcement agencies, including the National Anti-Corruption Bureau, the Prosecutor General’s Office, and the Security Service of Ukraine, are awaiting Oleksandr Onyshchenko in Ukraine with their arms open, along with all of his "compromising materials," the comment reads.

As UNIAN reported earlier, the Ukrainska Pravda online newspaper published a statement by Onyshchenko claiming he had allegedly handed some "incriminating evidence" regarding Poroshenko to the U.S. intelligence agencies. The statement followed the announcement by the Ukrainian Security Service that Onyshchenko was plotting a "massive information attack on Ukraine within the framework of a strategy agreed with the Kremlin".

The SBU earlier said evidence had been obtained on signs of Onyshchenko having committed a criminal offense under Art. 111 of the Criminal Procedural Code of Ukraine, which is treason.

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Read alsoNABU reports sharp profit growth at Ukrgazvydobuvannia since elimination of Onyschchenko’s illegal "gas schemes"In June 2016, the National Anti-Corruption Bureau and specialized anti-corruption prosecutor's office reported they had exposed an organized criminal group, which inflicted damage to the state in the amount of more than UAH 3 billion as a result of joint contractual activities with Ukrgazdobuvannia.

According to NABU, Onyshchenko was an organizer of the corruption scheme.

July 5, the Verkhovna Rada agreed to allow criminal prosecution, detention and arrest of Onyshchenko. Ahead of this move, having taken advantage of his parliamentary immunity, he left Ukraine.

Read alsoFive suspects under Onyshchenko case plead guilty, agree to cooperate with investigators – NABUNABU summoned him for questioning as a suspect twice, but he never appeared before the investigators.

August 9 Solomenskiy district court of Kyiv allowed detention of Onyshchenko for the purpose of bringing him in to participate in a hearing to consider taking him into custody as a preventive measure.