KIEV, June 8 – The Interior Ministry has opened a criminal inquiry against the national joint-stock company Naftogaz of Ukraine's former management on charges of abuse of office, Interior Minister Arsen Avakov said on Facebook on Sunday evening.

The suspects colluded with the managers and shareholders of RosUkrEnergo and Group DF in 2010 when the International Court of Arbitration in Stockholm obliged Naftogaz to return 12.1 billion cubic meters of gas to RosUkrEnergo, he said.