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The Office of the Prosecutor General of Ukraine has opened another case against former President Petro Poroshenko on charges of treason amid the leak of audio recordings made public by Ukrainian MP Andriy Derkach.

Read also"Critical": Biden put pressure on Poroshenko on PrivatBank nationalization, leak claims

The information was included in the Unified Register of Pretrial Investigations. The probe began under Part 1 of Article 111 (high treason) and Part 2 of Article 364 (abuse of power or official position) of the Criminal Code, the Ukrayinska Pravda online newspaper reported citing its sources.

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A flash drive with audio recordings of phone calls between Poroshenko and former U.S. Vice President Joe Biden and former Secretary of State John Kerry was added to the materials of the case.

As UNIAN reported earlier, Ukrainian MP Andriy Derkach on May 19 made public leaked audio recordings of phone conversations held by Biden, Kerry and Poroshenko. In particular, the then Ukrainian president Poroshenko discussed a lot of issues of domestic politics with the U.S. politicians, such as tariffs, the nationalization of PrivatBank, the dismissal of the then Prosecutor General Viktor Shokin, and the appointment of Yuriy Lutsenko to the post of prosecutor general, etc.