The national joint-stock company Naftogaz of Ukraine expects that the Stockholm arbitration in May will decide on the litigation of the NAK with the Russian Gazprom, said Yury Vitrenko, the chief commercial director of the NAK, in a comment on his Facebook page.

"We are awaiting the decision of the arbitration tribunal under the gas supply contract in May. The delay is obviously connected with the fact that the tribunal took more time to make a decision, "he wrote.

Vitrenko added that, unfortunately, he can not disclose the other details..

Earlier, Gazprom reported that on June 30, the Stockholm Arbitration will decide on the dispute with Naftogaz under the contract for the sale of natural gas from 2009 on June 30, 2017.

Recall that the mutual claims of Gazprom and Naftogaz under the gas purchase and sale contract are about $ 45.7 billion and $ 17.9 billion (without interest - $ 36.7 billion and $ 14 billion), respectively.

In December 2016, the Stockholm Arbitration Court completed a hearing on the Naftogaz case with Gazprom,.

As reported, Gazprom in June 2014 appealed to the Arbitration Institute of the Stockholm Chamber of Commerce with a request for arbitration in order to recover from Naftogaz debt for the gas supplied in 2013-2014, as well as funds under the formula "take, or pay".

For its part, Naftogaz filed a lawsuit about retroactive price changes, reimbursement of overpayments and the abolition of the ban on re-export. The court united both lawsuits.

"Naftogaz of Ukraine" on the "transit" claim demanded to transfer its rights and obligations under the transit agreement to the operator of the GTS - the company Ukrtransgaz in accordance with the requirements of the Third Energy Package, as well as to change the methodology for calculating the transit tariff in accordance with European standards and provisions of the energy and antimonopoly legislation of Ukraine and EU.