Victor Pinchuk / Photo from UNIAN

Ukraine's Prosecutor General's Office (PGO) has called businessman Victor Pinchuk in for questioning as a witness in criminal proceedings.

A subpoena for Pinchuk was posted on the PGO's website.

According to the document, Victor Mykhailovych Pinchuk should appear in the PGO's special investigations department on August 27.

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Read alsoNo Manafort signature in Yanukovych Party's "black ledgers" – Lutsenko

Procedural actions will be carried out in criminal proceedings No. 42016000000002148.

The case was opened on August 19, 2016.

According to media reports, Pinchuk's interrogation is connected with an investigation into the case of the so-called "black ledgers" of the Party of Regions.

As UNIAN reported earlier, Ukrainian Prosecutor General Yuriy Lutsenko says the so-called "black ledgers" of the Party of the Regions – accounting papers where the amounts of money paid by the disgraced Ukrainian ex-president Viktor Yanukovych for various services – had no signature by the party's U.S. political consultant Paul Manafort that would confirm the actual receipt of money and therefore cannot serve as sole evidence of him receiving such payments from Ukrainian politicians.