Read more: Yanukovych treasurers Katsuba brothers put on wanted list having fled from Ukraine
Pre-trial investigation into the appropriation, embezzlement or misappropriation of property through abuse of office was carried out against brothers Serhii and Oleksandr Katsuba.
Oleksandr Katsuba was also charged with fraud of 3.4 billion cubic meters of gas worth 12 billion hryvnia and belonged to the Naftohaz of Ukraine company.
The Katsuba family is also linked to the purchase of two overpriced jack-up rigs (so-called "Boiko platforms") for Chornomornaftogaz in 2011-2012.
The brothers were declared crime suspects in September 2015, after that they fled Ukraine.
The PGO put Serhii Katsuba and his brother Oleksandr on the international wanted list on Oct. 1, 2015. However, the PGO closed the criminal proceeding and, accordingly, stopped searching for Katsuba brothers on Jan. 5, 2016.
Serhii Katsuba was people's deputy of the Verkhovna Rada of the seventh convocation (2012-2014), while Oleksandr Katsuba was the deputy head of Naftohaz of Ukraine at the time.
Gas of Ukraine-2020 was part of the VETEK group of companies owned by the fugitive Serhii Kurchenko.