Trilateral negotiations on a future contract on the transit of Russian gas via the Ukrainian transport system will be held on 16 September, Naftogaz Ukrayiny CEO Andriy Kobolyev has told the German business daily Handelsblatt.
The talks will be held by representatives of Ukraine, the EU and Russia.
They are expected to meet in Brussels. Russia has not yet said who will represent it at the talks.
"Under the pressure from her own party and the European Parliament, Merkel promised to launch Nord Stream II only if gas transit via Ukraine is guaranteed in parallel. Naftogaz has not received any such commitments from Russia," he said.
The Nord Stream II gas pipeline is expected to run across the Baltic Sea to connect Russian suppliers to European customers. Its planned length exceeds 1,200 km with the scheduled transport capacity of 55bn cu.m. of gas per year. The project is being carried out by Russian Gazprom in cooperation with such European companies as Engie, Uniper, OMV, Shell and Wintershall.