KIEV, July 1 - Naftogaz Ukrayiny on June 30 sent a letter to Gazprom, proposing to sign an addendum to the 2009 natural gas supply contract, stipulating details of possible shipments in the third quarter of 2016, the state holding company's CEO Andriy Kobolev said on Channel 5 television.

The real price for the gas offered by Gazprom to Ukraine for the third quarter, considering its higher calorific value, will be $172-175 per 1,000 cubic meters, he said.